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WO2018174579A1 - Procédé et dispositif pour effectuer une recherche de mobile dans un système de communication mobile - Google Patents

Procédé et dispositif pour effectuer une recherche de mobile dans un système de communication mobile Download PDF

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Publication number
WO2018174579A1
WO2018174579A1 PCT/KR2018/003331 KR2018003331W WO2018174579A1 WO 2018174579 A1 WO2018174579 A1 WO 2018174579A1 KR 2018003331 W KR2018003331 W KR 2018003331W WO 2018174579 A1 WO2018174579 A1 WO 2018174579A1
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WO
WIPO (PCT)
Prior art keywords
terminal
base station
data
bsr
paging
Prior art date
Application number
PCT/KR2018/003331
Other languages
English (en)
Korean (ko)
Inventor
김성훈
김동건
김상범
장재혁
진승리
Original Assignee
삼성전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020170125012A external-priority patent/KR102367840B1/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Priority to EP18771935.6A priority Critical patent/EP3589040B1/fr
Priority to CN202211021871.2A priority patent/CN115568016A/zh
Priority to CN201880020499.9A priority patent/CN110463297B/zh
Priority to US16/495,726 priority patent/US11463986B2/en
Publication of WO2018174579A1 publication Critical patent/WO2018174579A1/fr
Priority to US17/954,810 priority patent/US11743862B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the present invention relates to a method and apparatus for performing paging in a next generation mobile communication system.
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band).
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • Array antenna, analog beam-forming, and large scale antenna techniques are discussed.
  • 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation
  • cloud RAN cloud radio access network
  • D2D Device to Device communication
  • D2D Device to Device communication
  • CoMP Coordinated Multi-Points
  • Hybrid FSK and QAM Modulation FQAM
  • SWSC Slide Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA non orthogonal multiple access
  • SCMA sparse code multiple access
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M machine to machine
  • MTC Machine Type Communication
  • IT intelligent Internet technology services can be provided that collect and analyze data generated from connected objects to create new value in human life.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.
  • the present invention proposes a method of configuring the plurality of time slots.
  • the method of the base station in the wireless communication system according to an embodiment of the present invention, the step of checking a paging time interval for transmitting a paging (paging) message to the terminal, and to the terminal, through the beam sweeping in the paging time interval And repeatedly transmitting the paging message.
  • a method of a terminal includes: checking a paging time interval for receiving a paging message and repeatedly transmitting the paging time interval through a beam sweeping of a base station. Monitoring the message.
  • a base station includes a transceiver, and
  • a controller for checking a paging time interval for transmitting a paging message to the terminal and repeatedly transmitting the paging message to the terminal through beam sweeping in the paging time interval.
  • the terminal checks a transceiver, and a paging time interval for receiving a paging message, and repeatedly transmitted through the beam sweeping of the base station during the paging time interval It may include a control unit for monitoring the paging message.
  • paging may be efficiently performed to a terminal using a beam antenna.
  • 1A is a diagram illustrating the structure of a next generation mobile communication system.
  • 1B is a conceptual diagram illustrating a paging time point in the conventional LTE technology.
  • 1C is a diagram illustrating an operation of delivering paging to a terminal using a plurality of time slots according to the first embodiment of the present invention.
  • FIG. 1D is a diagram illustrating an operation of delivering paging to a terminal by using a time slot in subframe units according to the first embodiment of the present invention.
  • FIG. 1E is a diagram illustrating an operation of delivering paging to a terminal using a plurality of time slots within a single subframe according to the first embodiment of the present invention.
  • FIG. 1F is a diagram illustrating an operation of delivering paging to a terminal using a plurality of time slots over several subframes according to the first embodiment of the present invention.
  • 1G is a flowchart of delivering paging to a terminal by using a plurality of time slots according to a first embodiment of the present invention.
  • 1H is a diagram illustrating a procedure of a terminal operation according to the first embodiment of the present invention.
  • 1I is a block diagram illustrating an internal structure of a terminal according to the first embodiment of the present invention.
  • 1J is a block diagram showing the configuration of a base station according to the first embodiment of the present invention.
  • FIG. 2A is a diagram illustrating a structure of an LTE system for reference for explanation of the present invention.
  • 2b is a diagram illustrating a radio protocol structure of an LTE system for reference for explanation of the present invention.
  • 2ca and 2cb are exemplary diagrams of a message flow between a terminal and a base station when using a method for distributing soft buffer sizes according to a second embodiment of the present invention.
  • 2d is a diagram illustrating an operation sequence of a terminal according to the second embodiment of the present invention.
  • 2E is a block diagram of a terminal according to a second embodiment of the present invention.
  • 3A is a diagram illustrating a structure of a next generation mobile communication system to which the present invention is applied.
  • 3B is a diagram illustrating the structure of another next-generation mobile communication system to which the present invention can be applied.
  • 3C is an exemplary diagram of a frame structure used by an NR system to which the present invention is applied.
  • 3D is a diagram illustrating a structure of a subframe in which a synchronization signal is transmitted in a next generation mobile communication system.
  • 3E is a diagram for describing an overall operation of channel measurement using a synchronization signal according to a third embodiment of the present invention.
  • 3F is a view illustrating a channel measurement operation using a synchronization signal of a terminal in an IDLE state according to a third embodiment of the present invention.
  • 3G is a block diagram illustrating an internal structure of a terminal according to a third embodiment of the present invention.
  • 3H is a block diagram illustrating a configuration of a base station according to a third embodiment of the present invention.
  • 4A is a diagram illustrating the structure of an LTE system to which the present invention can be applied.
  • 4b is a diagram illustrating a radio protocol structure in an LTE system to which the present invention can be applied.
  • 4c is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention can be applied.
  • 4d is a diagram illustrating a radio protocol structure of a next generation mobile communication system to which the present invention can be applied. .
  • FIG. 4E is a diagram illustrating a procedure for configuring UEs and bearers by each UE in a next generation mobile communication system of the present invention.
  • 4F is a diagram illustrating a dual connectivity scenario considered by a fourth embodiment of the present invention in a next generation mobile communication system.
  • 4G is a diagram illustrating another dual access scenario considered by the fourth embodiment of the present invention in a next generation mobile communication system.
  • 4h is a diagram illustrating the operation of a terminal to which the fourth embodiment of the present invention is applied.
  • 4i is a diagram illustrating the operation of a terminal to which the fourth embodiment of the present invention is applied.
  • 4J illustrates the structure of a terminal according to the fourth embodiment of the present invention.
  • 4K is a block diagram of a base station in a wireless communication system according to a fourth embodiment of the present invention.
  • 5A is a diagram illustrating the structure of an LTE system to which the present invention can be applied.
  • 5b is a diagram showing a radio protocol structure in an LTE system to which the present invention can be applied.
  • 5C is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention can be applied.
  • 5d is a diagram illustrating a radio protocol structure of a next generation mobile communication system to which the present invention can be applied. .
  • FIG. 5E is a diagram illustrating a procedure for configuring UEs and bearers by each UE in a next generation mobile communication system of the present invention.
  • 5F is a diagram illustrating a procedure for requesting transmission resources from a base station by a terminal according to a fifth embodiment of the present invention to transmit uplink data.
  • 5G is a diagram illustrating formats that a terminal can use when transmitting a BSR to a base station according to a fifth embodiment of the present invention.
  • 5H illustrates the operation of a terminal according to Embodiments 5-1, 5-2, 5-3, 5-4, and 5-5 of the present invention. It is a diagram showing.
  • 5i illustrates the structure of a terminal according to the fifth embodiment of the present invention.
  • 5J is a block diagram of a base station in a wireless communication system according to a fifth embodiment of the present invention.
  • connection nodes terms referring to network objects, terms referring to messages, terms referring to interfaces between network objects, terms referring to various identification information, used in the following description. Etc. are illustrated for convenience of description. Therefore, the present invention is not limited to the terms described below, and other terms may be used to refer to objects having equivalent technical meanings.
  • the present invention uses the terms and names defined in the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standard.
  • 3GPP LTE 3rd Generation Partnership Project Long Term Evolution
  • the present invention is not limited to the above terms and names, and may be equally applied to systems conforming to other standards.
  • 1A is a diagram illustrating the structure of a next generation mobile communication system.
  • a radio access network of a next generation mobile communication system is shown as a next generation base station (New Radio Node B, NR NB) 1a-10 and an NR CN (1a-05, New Radio Core Network). It is composed.
  • the user terminal (New Radio User Equipment, NR UE or terminal) 1a-15 connects to the external network via NR NB 1a-10 and NR CN 1a-05.
  • the NR NB 1a-10 corresponds to an eNB (Evolved Node B) of an existing LTE system.
  • the NR NB is connected to the NR UE 1a-15 through a wireless channel and can provide superior service than the existing Node B.
  • a device that collects and schedules state information such as buffer states, available transmit power states, and channel states of UEs is required. (1a-10) is in charge.
  • One NR NB typically controls multiple cells.
  • the NR CN 1a-05 performs functions such as mobility support, bearer setup, and QoS setup.
  • the NR CN is a device that is in charge of various control functions as well as mobility management function for a terminal and is connected to a plurality of base stations.
  • the next generation mobile communication system can be linked with the existing LTE system, NR CN is connected to the MME (1a-25) through a network interface.
  • the MME is connected to the eNB 1a-30 which is an existing base station.
  • 1B is a conceptual diagram illustrating a paging time point in the conventional LTE technology.
  • DRX operation is a way to improve power consumption.
  • DRX operation in standby mode does not always monitor paging, but periodically.
  • the terminal performs a reception operation to receive a paging signal from the base station.
  • a reception operation may be performed periodically by performing a reception operation only for a specific time interval, which is called DRX.
  • DRX operation of terminals in a standby state is performed through Equation 1 below.
  • the SFN increases by 1 for each radio frame.
  • SFN System Frame Number. 10 bits (MSB 8 bits explicit, LBS 2 bits implicit)
  • T DRX cycle of the UE. Transmitted on SIB2.
  • nB Transmitted on SIB 2. ENUMERATED ⁇ 4T, 2T, T, T / 2, T / 4, T / 8, T / 16, T / 32 ⁇ .
  • IMSI mod 1024 IMSI mod 1024 (IMSI is a unique number assigned to each terminal)
  • T and nB are values included in SIB2 (SystemInformationBlockType2) and provided from a base station.
  • T may have one of ⁇ rf32, rf64, rf128, rf256 ⁇ , and r32 represents a 32 Radio frame length. That is, r32 means 320 ms.
  • the T value applied in the above equation is derived through coordination between the terminal, the base station, and the MME.
  • the base station provides a default DRX value to the terminal using SIB1, which is one of the system information broadcast.
  • the UE When the terminal wants a DRX cycle shorter than the default DRX value, the UE provides the desired DRX value as a UE specific DRX value to the MME through an ATTACH process. If there is paging for the terminal, the MME transmits the UE specific DRX value provided from the terminal with the paging to the base station. The terminal determines a short value between the UE specific DRX value transmitted to the MME and the default DRX value provided from the base station as a DRX cycle. The base station also determines a shorter value between the UE specific DRX value received from the MME and the default DRX value it is broadcasting as a DRX cycle. The DRX period value is an actual T value applied in the equation. Accordingly, the terminal and the base station select the same DRX cycle, the base station determines the PF based on the DRX cycle, and then transmits paging to the terminal.
  • One PF has a subframe capable of delivering paging. This is called a paging subframe 1b-10.
  • the UE monitors its paging in one paging subframe in the PF derived from the above equation.
  • the one paging subframe is called Paging Occasion (PO, 1b-15).
  • the PO is derived through Equation 2 below.
  • i_s floor (UE_ID / N) mod Ns
  • the i_s value is determined based on the UE_ID (terminal identifier).
  • the UE may derive its own PO by substituting the i_s value derived by Equation 2 into Tables 1 and 2 below.
  • Table 1 applies to Frequency Division Duplex (FDD) and Table 2 applies to all UL / DL configurations for Time Division Duplex (TDD).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • 1C illustrates an operation of delivering paging to a terminal by using a plurality of time slots according to the first embodiment of the present invention.
  • Next generation mobile communication systems are applicable to both low and high frequency bands.
  • Low frequency cells below 6 GHz typically form a service area using omni-directional or sector antennas. In the present invention, this is called a single beam antenna.
  • the base station 1c-05 transmits the paging using only one time slot (1c-10).
  • a coverage area is guaranteed by applying a beam antenna that concentrates the antenna gain within a very narrow angle. Since the beam antenna has a very narrow main lobe, the multi-beam antenna may be used to cover the entire service area. In addition, the terminal deviating from the beam antenna main lobe may not receive a signal transmitted from the antenna. Since the base station does not know the location of the terminal in the standby mode, it is necessary to transmit the paging on all beam antennas.
  • the present invention proposes a method of configuring the plurality of time slots.
  • the unit of time slot may be one or more OFDMA symbols, TTIs, subframes, or the like.
  • FIG. 1D illustrates an operation of delivering paging to a UE by using a time slot in a subframe unit according to the first embodiment of the present invention.
  • the terminal monitoring the paging in the cell supporting the beam antenna determines a PO of one or more of the plurality of paging subframes in the PF according to a predetermined equation.
  • the PO need not be contiguous.
  • the base station sequentially transmits paging for the terminal in the one or more POs.
  • One PO corresponds to one beam antenna.
  • the UE may successfully receive paging from one PO. Accordingly, the terminal may monitor paging in all POs, or may monitor paging only in POs corresponding to one or N best beams.
  • 1E illustrates an operation of delivering paging to a UE using a plurality of time slots within a single subframe according to the first embodiment of the present invention.
  • the multi-beam antenna when the multi-beam antenna is applied, a plurality of time slots are required to transmit paging. Assuming that the existing PF formula is reused, a plurality of time slots capable of transmitting paging in one PF are required. In the present embodiment, the unit of the time slot is shorter than the subframe, and the time slot exists in one PO (1e-05). Therefore, the formula used to derive the existing PO may be recycled.
  • the base station transmits paging for the terminal through beam sweeping in the one or more time slots. Each time slot in one PO corresponds to one beam antenna, and only one antenna transmits paging at a time.
  • the terminal although there are a plurality of time slots in which one's paging can be transmitted in one PO, paging can be successfully received in one time slot. Accordingly, the terminal may monitor paging in all time slots or monitor paging only in time slots corresponding to one or N best beams.
  • 1F illustrates an operation of delivering paging to a UE by using a plurality of time slots over several subframes according to the first embodiment of the present invention.
  • a plurality of time slots are required to transmit paging.
  • a unit of the time slot is shorter than a subframe, and the time slot 1f-05 exists over a plurality of POs.
  • one terminal has 4, 5, 6, and 9 subframes as POs, and each PO has 2 time slots.
  • Each time slot corresponds to one beam antenna.
  • the terminal monitoring the paging in the cell supporting the beam antenna determines one or more POs among the plurality of paging subframes in the PF according to a predetermined equation.
  • the PO need not be contiguous.
  • the base station sequentially transmits paging for the terminal through beam sweeping in time slots in the one or more POs.
  • the terminal there are a plurality of time slots in which one's paging can be transmitted in one PF, but the paging is successfully received in one time slot. Accordingly, the terminal may monitor paging in all time slots or monitor paging only in time slots corresponding to one or N best beams.
  • 1G is a flowchart of delivering paging to a terminal by using a plurality of time slots according to a first embodiment of the present invention.
  • the terminal 1g-05 receives time slot information (eg, the number of time slots) corresponding to the multi-beam antenna from the base station 1g-10 through the system information 1g-15. At this time, each time slot corresponds to one beam antenna.
  • time slot information eg, the number of time slots
  • each time slot corresponds to one beam antenna.
  • the above information is provided only in a cell supporting a multi-beam antenna, and need not be provided in a cell supporting a single beam antenna. Therefore, a cell providing the above information as system information may be regarded as a cell supporting a multi-beam antenna.
  • the terminal applies the operation of receiving the paging in the multi-beam antenna, otherwise, applies the operation of receiving the paging in the single beam antenna (1g-20).
  • Receiving the paging in a single beam antenna is the same as that in the existing LTE system, characterized in that there is one PO in one PF.
  • various examples may exist as discussed above, and a plurality of POs may exist in one PF.
  • the base station transmits paging through beam sweeping for each PO or time slot (1g-25).
  • the UE may monitor paging in all POs or may monitor paging only in time slots corresponding to one or N best beams (1g-30).
  • 1H is an operation of a terminal according to the first embodiment of the present invention.
  • step 1h-05 the terminal receives time slot information (eg, the number of time slots) corresponding to the multi-beam antenna from the base station through system information.
  • time slot information eg, the number of time slots
  • the terminal applies the operation of receiving the paging in the multi-beam antenna when providing time slot information, and otherwise applies the operation of receiving the paging in the single beam antenna.
  • the UE may monitor paging in all POs or may monitor paging only in time slots corresponding to one or N best beams.
  • FIG. 1I illustrates a structure of a terminal according to the first embodiment of the present invention.
  • the terminal includes a radio frequency (RF) processor 1i-10, a baseband processor 1i-20, a storage unit 1i-30, and a controller 1i-40. .
  • RF radio frequency
  • the RF processor 1i-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 1i-10 up-converts the baseband signal provided from the baseband processor 1i-20 into an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 1i-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. Can be. In the figure, only one antenna is shown, but the terminal may include a plurality of antennas.
  • the RF processor 1i-10 may include a plurality of RF chains.
  • the RF processor 1i-10 may perform beamforming. For the beamforming, the RF processor 1i-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processor may perform MIMO, and may receive multiple layers when performing the MIMO operation.
  • the baseband processor 1i-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the system. For example, during data transmission, the baseband processor 1i-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 1i-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 1i-10. For example, according to an orthogonal frequency division multiplexing (OFDM) scheme, during data transmission, the baseband processor 1i-20 generates complex symbols by encoding and modulating a transmission bit string, and generates the complex symbols by subcarriers.
  • OFDM orthogonal frequency division multiplexing
  • OFDM symbols are configured through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • the baseband processor 1i-20 splits the baseband signal provided from the RF processor 1i-10 in OFDM symbol units and subcarriers through fast Fourier transform (FFT) operations. After recovering the mapped signals, the received bit stream is recovered through demodulation and decoding.
  • FFT fast Fourier transform
  • the baseband processor 1i-20 and the RF processor 1i-10 transmit and receive signals as described above. Accordingly, the baseband processor 1i-20 and the RF processor 1i-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. Furthermore, at least one of the baseband processor 1i-20 and the RF processor 1i-10 may include a plurality of communication modules to support different radio access technologies. In addition, at least one of the baseband processor 1i-20 and the RF processor 1i-10 may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include a wireless LAN (eg, IEEE 802.11), a cellular network (eg, LTE), and the like. In addition, the different frequency bands may include a super high frequency (SHF) (eg 2.NRHz, NRhz) band and a millimeter wave (eg 60 GHz) band.
  • SHF super high frequency
  • the storage unit 1i-30 stores data such as a basic program, an application program, and setting information for the operation of the terminal.
  • the storage unit 1i-30 may store information related to an access node (eg, a base station) that performs wireless communication using a wireless access technology.
  • the storage unit 1i-30 provides stored data at the request of the control unit 1i-40.
  • the controller 1i-40 controls the overall operations of the terminal. For example, the controller 1i-40 transmits and receives a signal through the baseband processor 1i-20 and the RF processor 1i-10. In addition, the controller 1i-40 records and reads data in the storage unit 1i-40. To this end, the controller 1i-40 may include at least one processor. For example, the controller 1i-40 may include a communication processor (CP) for performing control for communication and an application processor (AP) for controlling a higher layer such as an application program.
  • the control unit 1i-40 may include a multiple connection processing unit 1i-42 which performs a process for operating in the multiple connection mode.
  • 1J is a block diagram of a base station in a wireless communication system according to a first embodiment of the present invention.
  • the base station includes an RF processor 1j-10, a baseband processor 1j-20, a backhaul communication unit 1j-30, a storage unit 1j-40, and a controller 1j-50. It is configured to include.
  • the RF processor 1j-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of a signal. That is, the RF processor 1j-10 up-converts the baseband signal provided from the baseband processor 1j-20 into an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 1j-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. In the figure, only one antenna is shown, but the base station may have a plurality of antennas.
  • the RF processor 1j-10 may include a plurality of RF chains.
  • the RF processor 1j-10 may perform beamforming. For the beamforming, the RF processor 1j-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processor may perform a downlink MIMO operation by transmitting one or more layers.
  • the baseband processor 1j-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the radio access technology. For example, during data transmission, the baseband processor 1j-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 1j-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 1j-10. For example, according to the OFDM scheme, during data transmission, the baseband processor 1j-20 generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then IFFT. OFDM symbols are constructed by operation and CP insertion.
  • the baseband processor 1j-20 divides the baseband signal provided from the RF processor 1j-10 in OFDM symbol units and restores signals mapped to subcarriers through an FFT operation. After that, the received bit stream is recovered by demodulation and decoding.
  • the baseband processor 1j-20 and the RF processor 1j-10 transmit and receive signals as described above. Accordingly, the baseband processor 1j-20 and the RF processor 1j-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.
  • the backhaul communication unit 1j-30 provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit 1j-30 converts a bit string transmitted from the main base station to another node, for example, an auxiliary base station, a core network, etc. into a physical signal, and converts the physical signal received from the other node into a bit. Convert to heat
  • the storage unit 1j-40 stores data such as a basic program, an application program, and setting information for the operation of the main station.
  • the storage unit 1j-40 may store information on a bearer allocated to the connected terminal, a measurement result reported from the connected terminal, and the like.
  • the storage unit 1j-40 may store information that is a criterion for determining whether to provide or terminate multiple connections to the terminal.
  • the storage unit 1j-40 provides stored data at the request of the controller 1j-50.
  • the controller 1j-50 controls the overall operations of the base station. For example, the controller 1j-50 transmits and receives a signal through the baseband processor 1j-20 and the RF processor 1j-10 or through the backhaul communication unit 1j-30. In addition, the controller 1j-50 records and reads data in the storage unit 1j-40. To this end, the controller 1j-50 may include at least one processor.
  • the control unit 1j-50 may include a multiple connection processing unit 1j-52 which performs a process for operating in a multiple connection mode.
  • FIG. 2A is a diagram illustrating a structure of an LTE system for reference for explanation of the present invention.
  • the wireless communication system includes a plurality of base stations (2a-05) (2a-10) (2a-15) (2a-20), MME (Mobility Management Entity) 2a-25, and S. -GW (Serving-Gateway) (2a-30).
  • the user equipment (UE or UE) 2a-35 is externally connected via the base stations 2a-05 (2a-10) (2a-15) (2a-20) and S-GW 2a-30. Connect to the network.
  • the base stations 2a-05, 2a-10, 2a-15, and 2a-20 provide a wireless connection to terminals accessing the network as access nodes of the cellular network. That is, the base station (2a-05) (2a-10) (2a-15) (2a-20) collects the state information, such as the buffer state, available transmission power state, channel state, etc. of the terminals to service the traffic of users Scheduling to support connection between the terminals and a core network (CN).
  • the MME 2a-25 is a device that is in charge of various control functions as well as mobility management function for the terminal and is connected to a plurality of base stations.
  • S-GW 2a-30 is a device that provides a data bearer.
  • the MME 2a-25 and the S-GW 2a-30 may further perform authentication, bearer management, and the like for the terminal accessing the network, and the base station 2a-05. (2a-10) (2a-15) (2a-20) or the packet to be delivered to the base station (2a-05) (2a-10) (2a-15) (2a-20).
  • 2b is a diagram illustrating a radio protocol structure of an LTE system for reference for explanation of the present invention.
  • the NR to be defined in the future may be different from the radio protocol structure in this figure, but will be described for convenience of description of the present invention.
  • the radio protocol of the LTE system is PDCP (Packet Data Convergence Protocol) (2b-05) (2b-40) and RLC (Radio Link Control) (2b-10) (2b-35) at the terminal and the ENB, respectively. ), And MAC (Medium Access Control) (2b-15) (2b-30).
  • Packet Data Convergence Protocol (PDCP) (2b-05) (2b-40) is responsible for operations such as IP header compression / restore, and radio link control (hereinafter referred to as RLC) (2b-10) (2b -35) reconfigures the PDCP PDU (Packet Data Unit) to an appropriate size.
  • RLC Radio Link Control
  • MAC (2b-15) (2b-30) is connected to several RLC layer devices configured in one terminal, and performs the operation of multiplexing the RLC PDUs to the MAC PDU and demultiplexing the RLC PDUs from the MAC PDU.
  • the physical layer (2b-20) (2b-25) channel-codes and modulates higher layer data, converts the OFDM layer into OFDM symbols and transmits them to the wireless channel, or demodulates and channel decodes the OFDM symbols received through the wireless channel to the higher layer. It acts to deliver.
  • the physical layer uses HARQ (Hybrid ARQ) for additional error correction, and the receiving end transmits the reception of the packet transmitted by the transmitting end as 1 bit. This is called HARQ ACK / NACK information.
  • Downlink HARQ ACK / NACK information for uplink transmission is transmitted through PHICH (Physical Hybrid-ARQ Indicator Channel) physical channel, and uplink HARQ ACK / NACK information for downlink transmission is PUCCH (Physical Uplink Control Channel) or PUSCH. (Physical Uplink Shared Channel) It may be transmitted through a physical channel.
  • PHICH Physical Hybrid-ARQ Indicator Channel
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • the PHY layer may consist of one or a plurality of frequencies / carriers, and a technology of setting and using a plurality of frequencies simultaneously in one base station is called carrier aggreagation (hereinafter, referred to as CA).
  • CA technology means that only one carrier is used for communication between a terminal (or user equipment, UE) and a base station (E-UTRAN NodeB, eNB), and a subcarrier using an additional main carrier and one or more subcarriers. The amount of transmission can be dramatically increased by the number of.
  • a cell in a base station using a primary carrier is called a primary cell (PCell), and a secondary carrier is called a secondary cell (SCell).
  • PCell primary cell
  • SCell secondary cell
  • the technique of extending the CA function to two base stations is called dual connectivity (hereinafter referred to as DC).
  • DC dual connectivity
  • the UE connects and uses a main base station (Master E-UTRAN NodeB, hereinafter referred to as MeNB) and a secondary base station (Secondary E-UTRAN NodeB, hereinafter referred to as SeNB) at the same time.
  • MeNB Master E-UTRAN NodeB
  • SeNB Secondary E-UTRAN NodeB
  • the cells belonging to the master cell group (hereinafter referred to as MCG) and the secondary base station are referred to as secondary cell group (hereinafter referred to as SCG).
  • MCG master cell group
  • SCG secondary cell group
  • the representative cell of the main cell group is called the primary cell (hereinafter referred to as PCell), and the representative cell of the secondary cell group is called the primary secondary cell (hereinafter referred to as PSCell). do.
  • PCell primary cell
  • PSCell primary secondary cell
  • the terminal can use the LTE and NR at the same time.
  • the RRC (Radio Resource Control, RRC) layer is present above the PDCP layer of the terminal and the base station, respectively, and the RRC layer provides a connection control message related to access and measurement for radio resource control. You can give and receive. For example, measurement can be instructed to the terminal using the message of the RRC layer, the terminal can report the measurement result to the base station using the message of the RRC layer.
  • RRC Radio Resource Control
  • 2ca and 2cb are exemplary diagrams of a message flow between a terminal and a base station when using a method for distributing soft buffer sizes according to a second embodiment of the present invention.
  • the terminal 2c-01 in the dormant mode performs connection to the base station for generation of data to be sent or the like (2c-11).
  • the dormant mode data is not transmitted because the terminal is not connected to the network for power saving, etc., and a transition to the connected mode (RRC_CONNECTED) is required for data transmission. If the terminal succeeds in the access procedure to the base station (2c-03), the terminal is changed to the connected mode (RRC_CONNECTED) state, the terminal in the connected mode can transmit and receive data with the base station.
  • the base station fails to acquire the buffer related information of the terminal from the terminal (or from the previously stored core network), the terminal does not know how much data can be received in the downlink, the information is raised Until now, the base station should be conservatively operated so that the amount of transmission to the terminal is larger than the size of the buffer so that it does not overflow.
  • the channel is coded to the data to be corrected even if an error occurs so that data is not lost. Accordingly, the bits transmitted by the actual base station to the terminal transmit the channel coded data. do.
  • the channel coded data is N times larger than the original data (N is a real number) in some cases, and the channel coded data is called a soft bit.
  • the total amount of soft bits that the terminal can process is called the total number of soft channel bits.
  • the total soft channel bits are defined as fixed values for each category (type) of the terminal. The following shows the total soft channel bits for each terminal category.
  • UE Category Maximum number of DL-SCH transport block bits received within a TTI (Note 1) Maximum number of bits of a DL-SCH transport block received within a TTI Total number of soft channel bits Maximum number of supported layers for spatial multiplexing in DL Category 1 10296 10296 250368
  • the base station when the base station does not acquire the buffer related information of the terminal from the terminal (or a previously stored core network), the base station cannot know how much data can be received in downlink, and thus, know the information. Until now, the base station must transmit downlink data assuming the lowest total soft channel bits defined in the standard so that the overflow does not occur in the soft buffer size for storing the soft bits of the terminal.
  • the base station since the base station does not have the capability information of the terminal including the buffer related information of the terminal as described above, the base station requests the corresponding information and receives the capability information from the terminal (2c-13). At this time, when the terminal transmits the LTE-related capability information as in this example, the terminal includes the category information of the terminal and transmits. As described above, the total soft channel bits corresponding to the categories of the terminal are defined.
  • the base station receiving the information may determine what capability the terminal has. Accordingly, when the terminal supports the CA function or the MIMO function, the base station may set the terminal to use the corresponding function (2c-15).
  • the above configuration may be transmitted using an RRCConnectionReconfiguration message of the RRC layer.
  • the terminal transmits an acknowledgment message indicating that the configuration has been received, which is transmitted using an RRCConnectionReconfigurationComplete message of the RRC layer (2c-17).
  • the base station and the terminal apply configuration information, respectively (2c-19) (2c-20).
  • the base station and the terminal that transmit and receive the configuration determine a soft buffer size (N IR ) for each hybrid automatic repeat request (HARQ) process for each serving cell.
  • the HARQ process is a unit for distinguishing data transmission in parallel in one serving cell.
  • the N IR value is determined by Equation 1 below.
  • the Nsoft value is a total soft channel bit value in Table 3
  • Kc is a value determined according to the number of serving cells supported for each category of the UE, and KMIMO simultaneously performs parallel transmission using a plurality of antennas.
  • the parameter varies depending on whether MIMO technology is used
  • MDL_HARQ is the maximum number of HARQ processes (8 in FDD) in one serving cell of a downlink
  • Mlimit has a value of 8 as a constant. That is, the base station calculates the soft buffer size for each HARQ process for each serving cell through the category information of the terminal through the above-described formula, and determines the amount of downlink data in consideration of this.
  • the terminal also determines the soft buffer size for each HARQ process as described above, the base station determines the amount of data to be transmitted to the terminal according to the determined amount and transmits, and the terminal receives using the soft buffer (2c-21).
  • the base station may command the terminal to enter the sleep mode (RRC_IDLE) again (2c-23).
  • RRC_IDLE the sleep mode
  • the RRCConnectionRelease message of the RRC layer can be used.
  • the terminal performs an operation performed in the sleep mode (2c-25).
  • the UE is related to neighbor cell information (eg, priority of a frequency used by a specific radio access technology (eg, LTE, NR, GSM, etc.)) and cell selection broadcasted by a base station.
  • a cell reselection is performed to reselect neighbor cells according to UE movement. This operation of selecting a cell and staying in that cell is called camping.
  • a scenario in which a terminal communicating in LTE camps to an NR cell through a mobile in a dormant mode may be considered (2c-27).
  • the terminal accesses the base station again due to generation of data to be sent (2c-31).
  • the terminal is connected to the NR base station, the terminal performing the access procedure can transmit and receive data with the base station.
  • the terminal may not know how much data can be received in downlink.
  • the base station should be conservatively operated so that the amount of transmission to the terminal is greater than the size of the buffer so that it does not overflow (overflow).
  • the NR system is expected to vary in the bandwidth used by the base station (cell) and the bandwidth used by the terminal. Accordingly, when CA is used as in the case of LTE, since the bandwidth for each serving cell may be different, it is necessary to distribute the soft buffer in consideration of the bandwidth for each serving cell.
  • the NR base station does not have the capability information of the terminal including the buffer related information of the terminal. Accordingly, the terminal requests the corresponding information and receives the capability information from the terminal. (2c-33).
  • the total soft channel bit information is separately reported in addition to the NR category information of the terminal. Accordingly, the network acquires the capability information of the terminal including the total soft channel bit information of the terminal.
  • the base station receiving the information may determine what capability the terminal has. Accordingly, when the terminal supports the CA function or the MIMO function, the base station may set the terminal to use the corresponding function (2c-35). In this case, if the CA function is set to the UE, the present invention includes soft channel bit information for each serving cell.
  • the soft channel bits for each serving cell may be, for example, information indicating a soft channel bit directly or percentage information on total soft channel bit information reported by the terminal.
  • the above configuration may be transmitted using an RRCConnectionReconfiguration message of the RRC layer.
  • the terminal transmits an acknowledgment message indicating that the configuration has been received, which is transmitted using an RRCConnectionReconfigurationComplete message of the RRC layer (2c-37).
  • the base station and the terminal apply configuration information, respectively (2c-39) (2c-40).
  • the base station and the terminal that transmit and receive the configuration determine the soft buffer size (NIR) for each HARQ process for each serving cell.
  • the base station and the terminal allocates a soft buffer size for each HARQ process using the set / configured soft channel bit information for each serving cell.
  • the base station and the terminal may equally divide the soft channel bits of the corresponding serving cell by the number of HARQ processes that can be supported per serving cell. That is, when the number of supported HARQ processes for each serving cell is 8, the BS and the UE allocate a value obtained by dividing the set / configured soft channel bit information by 8 to the soft buffer for each HARQ process, and then the data.
  • the above values are used for downlink transmission and reception (2c-41).
  • 2d is a diagram illustrating an operation sequence of a terminal according to the second embodiment of the present invention.
  • the terminal is in the dormant mode, after which the terminal accesses the base station for generation of data to be sent (2d-03).
  • the dormant mode data is not transmitted because the terminal is not connected to the network for power saving, etc., and a transition to the connected mode (RRC_CONNECTED) is required for data transmission.
  • RRC_CONNECTED a transition to the connected mode
  • the terminal is changed to the connected mode (RRC_CONNECTED) state, the terminal in the connected mode can transmit and receive data with the base station.
  • the terminal is requested to transmit the capability information of the terminal from the base station (2d-05).
  • the terminal transmits the LTE-related capability information, and at this time, including the category information of the terminal (2d-11).
  • LTE as described above with reference to FIGS. 2ca and 2cb, a total soft channel bit corresponding to each category of a terminal is defined.
  • the base station receiving the information may determine what capability the terminal has. Accordingly, when the terminal supports the CA function or the MIMO function, the base station may set the terminal to use the corresponding function.
  • CA and MIMO functions may be configured from the base station, which may be transmitted using an RRCConnectionReconfiguration message of the RRC layer (2d-13).
  • the terminal transmits an acknowledgment message indicating that the configuration has been received, which is transmitted using an RRCConnectionReconfigurationComplete message of the RRC layer.
  • the terminal applies the configured configuration information (2d-15). At this time, the terminal determines the soft buffer size (NIR) for each HARQ process for each serving cell.
  • the HARQ process is a unit for distinguishing data transmission in parallel in one serving cell.
  • the NIR value is determined based on Equation 2 below.
  • the Nsoft value is a total soft channel bit value in the aforementioned table
  • KC is a value determined according to the number of serving cells supported for each category of the UE, and KMIMO simultaneously performs parallel transmission using a plurality of antennas.
  • the parameter varies depending on whether MIMO technology is used
  • MDL_HARQ is the maximum number of HARQ processes (8 in FDD) in one serving cell of a downlink
  • Mlimit has a value of 8 as a constant. Accordingly, the terminal determines the soft buffer size for each HARQ process as described above, and receives downlink data using the corresponding soft buffer (2d-17).
  • the terminal transmits the NR-related capability information (2d-21).
  • the total soft channel bit information is reported in addition to the NR category information of the terminal.
  • the network acquires the capability information of the terminal including the total soft channel bit information of the terminal.
  • the base station receiving the information may determine what capability the terminal has. Accordingly, when the terminal supports the CA function or the MIMO function, the base station may set the terminal to use the corresponding function.
  • the terminal may receive a CA and MIMO function from the base station.
  • the terminal includes soft channel bit information for each serving cell.
  • the soft channel bits for each serving cell may be, for example, information indicating a soft channel bit directly or percentage information on total soft channel bit information reported by the terminal.
  • the configuration information may be transmitted using the RRCConnectionReconfiguration message of the RRC layer (2d-23).
  • the terminal transmits an acknowledgment message indicating that the configuration has been received, which is transmitted using an RRCConnectionReconfigurationComplete message of the RRC layer.
  • the terminal applies the configured configuration information (2d-25).
  • the terminal determines the soft buffer size (NIR) for each HARQ process for each serving cell.
  • the base station and the terminal allocates a soft buffer size for each HARQ process using the set / configured soft channel bit information for each serving cell.
  • the base station and the terminal may equally divide the soft channel bits of the corresponding serving cell by the number of HARQ processes that can be supported per serving cell. That is, when the number of supported HARQ processes for each serving cell is 8, the BS and the UE allocate a value obtained by dividing the set / configured soft channel bit information by 8 to the soft buffer for each HARQ process, and then the data.
  • the above values may be used for downlink transmission and reception (2d-27).
  • FIG. 2E illustrates a block configuration of a terminal according to the second embodiment of the present invention.
  • the terminal includes a radio frequency (RF) processor 2e-10, a baseband processor 2e-20, a storage 2e-30, and a controller 2e-40. do.
  • RF radio frequency
  • the RF processor 2e-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 2e-10 up-converts the baseband signal provided from the baseband processor 2e-20 into an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 2e-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. Can be.
  • FIG. 2E only one antenna is shown, but the terminal may include a plurality of antennas.
  • the RF processor 2e-10 may include a plurality of RF chains.
  • the RF processor 2e-10 may perform beamforming. For the beamforming, the RF processor 2e-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the baseband processor 2e-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the system. For example, during data transmission, the baseband processor 2e-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 2e-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 2e-10. For example, in accordance with an orthogonal frequency division multiplexing (OFDM) scheme, during data transmission, the baseband processor 2e-20 generates complex symbols by encoding and modulating a transmission bit stream and generates the complex symbols by subcarriers.
  • OFDM orthogonal frequency division multiplexing
  • OFDM symbols are configured through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • the baseband processor 2e-20 divides the baseband signal provided from the RF processor 2e-10 in OFDM symbol units and subcarriers through fast Fourier transform (FFT) operations. After recovering the mapped signals, the received bit stream is recovered through demodulation and decoding.
  • FFT fast Fourier transform
  • the baseband processor 2e-20 and the RF processor 2e-10 transmit and receive signals as described above. Accordingly, the baseband processor 2e-20 and the RF processor 2e-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. In addition, at least one of the baseband processor 2e-20 and the RF processor 2e-10 may include different communication modules to process signals of different frequency bands.
  • the different frequency bands may include a super high frequency (SHF) (eg 2.5 GHz, 5 Ghz) band and a millimeter wave (eg 60 GHz) band.
  • SHF super high frequency
  • 60 GHz millimeter wave
  • the storage unit 2e-30 stores data such as a basic program, an application program, and setting information for the operation of the terminal.
  • the controller 2e-40 controls overall operations of the terminal.
  • the controller 2e-40 transmits and receives signals through the baseband processor 2e-20 and the RF processor 2e-10.
  • the control unit 2e-40 records and reads data in the storage unit 2e-40.
  • the controller 2e-40 may include at least one processor.
  • the controller 2e-40 may include a communication processor (CP) for performing control for communication and an application processor (AP) for controlling a higher layer such as an application program.
  • the control unit 2e-40 includes a multiple connection processing unit 2e-42 which performs a process for operating in a multiple connection mode.
  • the controller 2e-40 may control the terminal to perform the procedure illustrated in the operation of the terminal illustrated in FIG. 2E.
  • the terminal when the terminal initially accesses the NR base station, the terminal transmits the category and total soft channel bit information of the terminal to the base station, and accordingly receives soft channel bit information for each serving cell from the NR base station, thereby receiving each HARQ.
  • Soft channel bits can be allocated for each buffer.
  • 3A is a diagram illustrating a structure of a next generation mobile communication system to which the present invention is applied.
  • a radio access network of a next generation mobile communication system is composed of a next generation base station (New Radio Node B, NR NB, 3a-10) and an NR CN (New Radio Core Network, 3a-05). do.
  • a new radio user equipment (hereinafter referred to as NR UE or terminal 3a-15) connects to an external network through NR NB 3a-10 and NR CN 3a-05.
  • the NR NB 3a-10 corresponds to an eNB (Evolved Node B) of the existing LTE system.
  • the NR NB is connected to the NR UE 3a-15 through a radio channel and can provide better service than the existing Node B.
  • a device that collects and schedules state information such as buffer states, available transmit power states, and channel states of UEs is required. (3a-10) is in charge.
  • One NR NB typically controls multiple cells.
  • the NR CN 3a-05 performs mobility support, bearer setup, QoS setup, and the like.
  • the NR CNs 3a-05 are devices that are in charge of various control functions as well as mobility management functions for terminals, and are connected to a plurality of base stations.
  • next generation mobile communication system may be interworked with the existing LTE system, and the NR CN 3a-05 is connected to the MME 3a-25 through a network interface.
  • the MME 3a-25 is connected to the eNB 3a-30 which is an existing base station.
  • 3B is a diagram illustrating the structure of another next-generation mobile communication system to which the present invention can be applied.
  • a cell served by a NR gNB 3b-05 operating on a beam basis may include a plurality of TRPs (Transmission Reception Points, 3b-10, 3b-15, 3b-20, 3b-25, and 3b-30). , 3b-35, 3b-40).
  • TRP Transmission Reception Points, 3b-10, 3b-15, 3b-20, 3b-25, and 3b-30.
  • 3b-35, 3b-40 represents a block that separates some functions of transmitting and receiving physical signals in the existing LTE base station (eNB), it is composed of a plurality of antennas.
  • the NR gNB 3b-05 may be represented by a central unit (CU) and a TRP by a distributed unit (DU).
  • CU central unit
  • DU distributed unit
  • the function of the NR gNB 3b-05 and TRP may be configured by separating each layer in a PDCP / RLC / MAC / PHY layer such as 3b-45. That is, the TRP may perform the functions of the corresponding layer only with the PHY layer (3b-15, 3b-25), and the TRP may perform the functions of the corresponding layers with only the PHY layer and the MAC layer (3b- 10, 3b-35, and 3b-40), the TRP may perform functions of the corresponding layers only with the PHY layer, the MAC layer, and the RLC layer (3b-20, 3b-30).
  • the TRPs 3b-10 to 3b-40 may use a beamforming technique for transmitting and receiving data by generating narrow beams in various directions using a plurality of transmit / receive antennas.
  • the user terminal 3b-50 connects to the NR gNB 3b-05 and the external network through the TRPs 3b-10 to 3b-40.
  • the NR gNB 3b-05 collects and schedules state information such as a buffer state, an available transmit power state, and a channel state of UEs to service users, and connects the UEs to the core network (CN). Support.
  • 3C is an exemplary diagram of a frame structure used by an NR system to which the present invention is applied.
  • the NR system aims at a higher transmission rate than LTE, and considers a scenario that operates at a high frequency to secure a wider bandwidth.
  • a scenario in which a directional beam is generated to transmit data having a high data rate to the terminal may be considered.
  • the base station, or the transmission / reception point (TRP, 3c-01) communicates with the terminals 3c-71, 3c-73, 3c-75, 3c-77 and 3c-79 in the cell.
  • the terminal 1 (3c-71) communicates using the beam # 1 (3c-51)
  • the terminal 2 (3c-73) communicates using the beam # 5 (3c-55)
  • the terminal 3, 4, 5 (3c-75) (3c-77) (3c-79) communicates through the beam # 7 (3c-57).
  • an overhead subframe (osf, 3c-03) through which a common overhead signal is transmitted exists in time.
  • the osf includes a primary synchronization signal (PSS) for timing acquisition of an orthogonal frequency division multiplexing (OFDM) symbol, a secondary synchronization signal (SSS) for detecting a cell ID, and an extended synchronization signal for obtaining timing of a subframe. ) And a beam reference signal (BRS) for identifying the beam.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • BSS beam reference signal
  • a physical broadcast channel including system information, a master information block (MIB), or information (for example, storing downlink beam bandwidth, system frame number, etc.) necessary for a terminal to access a system
  • PHCH physical broadcast channel
  • the base station transmits a reference signal using different beams for each symbol (or over several symbols).
  • a beam index value for distinguishing each beam may be derived from the reference signal.
  • different beams are swept every symbol. Assume the case is transmitted. That is, each beam is transmitted for each symbol in the osf (for example, beam # 1 (3c-51) is transmitted in the first symbol 3c-31), so that the terminal measures osf and transmits any The signal from the beam can be measured the most.
  • the terminals 3, 4, 5 (3c-75,) (3c-77), and (3c-79) communicate using beam # 7 in common (3c-11). It is assumed that the terminal 1 (3c-71) communicates using the beam # 1 (3c-13), and the terminal 2 (3c-73) communicates using the beam # 5 (3c-15).
  • the transmission beams # 1 (3c-51) to # 12 (3c-62) of the base station are mainly illustrated, but the reception beam of the terminal for receiving the transmission beam of the base station (for example, the terminal 1 (3c-81), (3c-83), (3c-85), (3c-87)) of (3c-71) may be further considered.
  • the terminal 1 has 4 beams 3c-81, 3c-83, 3c-85, and 3c-87, and determines which beam has the best reception performance. Perform beam sweeping. In this case, when several beams are not available at the same time, one oscillation beam may be used to receive as many osf as the number of reception beams, and the optimal transmission beam of the base station and the reception beam of the terminal may be found.
  • 3D is a diagram illustrating a structure of a subframe in which a synchronization signal is transmitted in a next generation mobile communication system.
  • the TRP 3d-10 transmits a directional downlink signal through twelve beams 3d-11 to 3d-22.
  • the terminal 3d-05 performs the PSS 3d-35 for acquiring the timing of the symbol, the SSS 3d-40 for detecting the cell ID, and the timing of the subframe to measure which beam is used to communicate with the TRP.
  • An ESS for acquiring and a BRS for identifying a beam are received.
  • a beam index value for distinguishing each beam may be derived from the reference signal. In this example figure, it is assumed that different beams are swept and transmitted for every symbol in the osf.
  • the terminal 3d-05 receives the plurality of first downlink signals xSS in the first subframe 3d-30.
  • the first subframe refers to a subframe in which a plurality of synchronization signals are transmitted and is called an integrated synchronization subframe (ISS). That is, the ISS is defined as a subframe in which a synchronization signal is transmitted among osf.
  • the first downlink signal may be based on PSS / SSS, and an ESS may be added at a high frequency using a beam, and a signal may be transmitted in a time period in which the corresponding beam is transmitted for each beam. That is, one first subframe 3d-30 is composed of n consecutive time periods (symbols), and a first downlink signal is transmitted in each time period.
  • the first downlink signal is transmitted in the first time period and another downlink signal is transmitted in the remaining time periods.
  • the terminal 3d-05 may receive only the first downlink signal of the serving cell / serving beam 3d-15, and in the beam group 3d-23 composed of the neighboring beams adjacent to the serving cell / serving beam The first downlink signal may be received.
  • the channel measurement of the terminal in the IDLE mode can be used.
  • it may be set to broadcast system information with a long DTX (Discontinuous transmission) interval for power efficiency in the network.
  • the xSS signal which is a synchronization signal for the IDLE mode terminal, may also be a signal transmitted in a 100ms period. Therefore, if the synchronization signal (xSS) is transmitted in a cycle of about 100ms, it is possible to broadcast the approximate time information for transmitting the xSS signal as system information.
  • the present invention proposes a specific solution to the above-mentioned content.
  • 3E is a diagram for describing an overall operation of channel measurement using a synchronization signal according to a third embodiment of the present invention.
  • the terminal 3e-01 in the dormant mode RRC_IDLE finds a suitable cell, camps at the base station 3e-03 (3e-05), and receives system information from the base station (3e-10).
  • data is not transmitted because the terminal is not connected to the network for power saving, etc., and transition to the connected mode (RRC_CONNECTED) is required for data transmission.
  • the camping means that the terminal stays in the cell and receives a paging message to determine whether data is coming downlink.
  • the system information in particular, the minimum system information (MSI) that is periodically broadcasted by the base station or other system information (OSI) requested by the terminal on-demand may be used.
  • MSI minimum system information
  • OSI system information
  • the terminal can be checked in the IDLE state without going to the RRC connection state, and in the case of the OSI, after requesting on-demand for information required by the terminal, the terminal receives it in dedicated or broadcast form.
  • MSI SIB2 may include the following information
  • OSI SIB3 and SIB5 may include the following information.
  • the serving cell transmits the information from the serving cell to the TRP of the neighbor cells through the network exchange. It is used for the purpose of reducing power loss of the terminal by informing beam information to be measured by the terminal among the belonging beams.
  • the terminal in the IDLE state knows the transmission time information of the synchronization signal xSS transmitted from the serving cell, but does not know the time information of the synchronization signal xSS transmitted from the neighboring cell, and thus the synchronization signal xSS of the neighboring cell.
  • the resources of the frequency band should be monitored and measured for all time.
  • the first information and the second information may be delivered through MSI (SIB2).
  • SIB2 MSI
  • the base station may inform the synchronization signal xSS transmission time of the neighbor cell similarly to neighCellConfig of LTE.
  • neighCellConfig in LTE has the following structure.
  • the IE NeighCellConfig is used to provide the information related to MBSFN and TDD UL / DL configuration of neighbor cells.
  • NeighCellConfig :: BIT STRING (SIZE (2))
  • NeighCellConfig field descriptions neighCellConfig Provides information related to MBSFN and TDD UL / DL configuration of neighbor cells of this frequency00: Not all neighbor cells have the same MBSFN subframe allocation as the serving cell on this frequency, if configured, and as the PCell otherwise10: The MBSFN subframe allocations of all neighbor cells are identical to or subsets of that in the serving cell on this frequency, if configured, and of that in the PCell otherwise01: No MBSFN subframes are present in all neighbor cells 11 :: Different UL / DL allocation in neighboring cells for TDD compared to the serving cell on this frequency, if configured, and compared to the PCell otherwiseFor TDD, 00, 10 and 01 are only used for same UL / DL allocation in neighboring cells compared to the serving cell on this frequency, if configured, and compared to the PCell otherwise.
  • neighCellSSPeriodicityConfig including information summarized in Table 5 below can be broadcasted in SIB3 and SIB5.
  • neighCellSSPeriodicityConfig 00 The xSS period of all neighboring cells is the same as the current cell and is transmitted in a time interval (+/ ⁇ x ms) similar to the current cell. That is, the neighbor cell xSS is searched based on the xSS transmission time point of the current cell. 01: The xSS period of some neighboring cells is the same as the current cell and is transmitted in a similar time period as the current cell. The neighbor cell xSS is searched first by applying the xSS time period of the current cell. If the search result is not satisfactory, increase the xSS search interval. 10: The above condition is not satisfied, and the xSS is searched for all time intervals for neighboring cell measurement. 11: reserved
  • the neighCellSSPeriodicityConfig includes the time information value corresponding to xms when 2 bits and 00 bits of information for searching for xSS time information of the neighbor cells listed in Table 5 above, and the xSS search interval when 01 bit is selected. Information may be included. The following search window may be introduced for the xSS search interval information.
  • xSSsearchWindowList sequence of xSSSearchWindow
  • xSSsearchWindow sequence of window length & offset
  • the terminal measures the synchronization signal xSS transmitted in the beam of the serving cell and the configured neighbor cell according to the configuration received from the system information (3e-15). That is, measurements are performed on the serving cell and the neighboring cell corresponding to each measurement object ID (3e-16 to 3e-18). Thereafter, the terminal determines what event occurs through the measured value measured through the synchronization signal of the serving cell and the neighboring cell (3e-20), and determines a later operation according to the current state of the terminal (3e-25). The event is performed if the following procedure is satisfied as in LTE.
  • the terminal performs cell selection, cell reselection, and initial access operations (3e-25). That is, the terminal performs a cell selectin operation when the serving cell does not exist, and performs a cell reselection operation when the terminal changes the serving cell from the serving cell currently camped on to the neighboring cell according to the measured value. If you need to change a cell and connect to that cell, perform initial access.
  • 3F is a view illustrating a channel measurement operation using a synchronization signal of a terminal in an IDLE state according to a third embodiment of the present invention.
  • the terminal acquires beam ID list for neighbor cell search and synchronization signal time information of the neighbor cell through the system information received from the NR base station (3f-05).
  • the UE performs synchronization signal xSS monitoring and channel measurement (3f-10). If the xSS signal is transmitted in the same time interval as the current serving cell in the beam IDs of all neighboring cells specified in the system information (when the time interval information bit 00 is received in the neighborCellSSPeriodicityConfig), the UE centers on the xSS transmission time point of the current cell. The neighbor cell xSS is searched in a similar time interval (+/- x ms).
  • the UE If the xSS signal is transmitted in the beam ID of some neighboring cells specified in the system information in the same time interval as the current serving cell (when the time interval information bit 01 is received in the neighborCellSSPeriodicityConfig), the UE indicates an xSS transmission time of the current cell.
  • the neighboring cell xSS is searched in a similar time interval (+/- x ms), and if the search result is not satisfactory, the xSS search interval is increased. As the increased search period, refer to information set in xSSsearchWindowList.
  • the xSS signal is not transmitted in the same time interval as the current serving cell in the beam IDs of all neighboring cells specified in the system information (when the time interval information bit 10 is received in the neighborCellSSPeriodicityConfig), all the intervals are measured for the neighboring cell measurement. Search for xSS.
  • the terminal determines an operation suitable for the current terminal state based on the measurement value defined above (3f-20). That is, the terminal performs a cell selectin operation when the serving cell does not exist, and performs a cell reselection operation when the terminal changes the serving cell from the serving cell which is currently camped on to the neighboring cell according to the measured value, and according to the measured value. If you need to change a cell and connect to that cell, perform initial access.
  • 3G is a block diagram illustrating an internal structure of a terminal according to a third embodiment of the present invention.
  • the terminal includes a radio frequency (RF) processor 3g-10, a baseband processor 3g-20, a storage unit 3g-30, and a controller 3g-40. do.
  • RF radio frequency
  • the RF processor 3g-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 3g-10 up-converts the baseband signal provided from the baseband processor 3g-20 into an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 3g-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. Can be. In the figure, only one antenna is shown, but the terminal may include a plurality of antennas.
  • the RF processor 3g-10 may include a plurality of RF chains.
  • the RF processor 3g-10 may perform beamforming. For the beamforming, the RF processor 3g-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processor may perform MIMO, and may receive multiple layers when performing the MIMO operation.
  • the baseband processor 3g-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the system. For example, during data transmission, the baseband processor 3g-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 3g-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 3g-10. For example, in accordance with an orthogonal frequency division multiplexing (OFDM) scheme, during data transmission, the baseband processor 3g-20 generates complex symbols by encoding and modulating a transmission bit stream, and the complex symbols are subcarriers.
  • OFDM orthogonal frequency division multiplexing
  • OFDM symbols are configured through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • the baseband processor 3g-20 divides the baseband signal provided from the RF processor 3g-10 in OFDM symbol units and subcarriers through fast Fourier transform (FFT) operations. After recovering the mapped signals, the received bit stream is recovered through demodulation and decoding.
  • FFT fast Fourier transform
  • the baseband processor 3g-20 and the RF processor 3g-10 transmit and receive signals as described above. Accordingly, the baseband processor 3g-20 and the RF processor 3g-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. Furthermore, at least one of the baseband processor 3g-20 and the RF processor 3g-10 may include a plurality of communication modules to support different radio access technologies. In addition, at least one of the baseband processor 3g-20 and the RF processor 3g-10 may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include a wireless LAN (eg, IEEE 802.11), a cellular network (eg, LTE), and the like. In addition, the different frequency bands may include a super high frequency (SHF) (eg 2.NRHz, NRhz) band and a millimeter wave (eg 60 GHz) band.
  • SHF super high frequency
  • the storage unit 3g-30 stores data such as a basic program, an application program, and setting information for the operation of the terminal.
  • the storage unit 3g-30 may store information related to an access node (for example, a base station) that performs wireless communication using a wireless access technology.
  • the storage unit 3g-30 provides stored data at the request of the controller 3g-40.
  • the controller 3g-40 controls overall operations of the terminal. For example, the controller 3g-40 transmits and receives a signal through the baseband processor 3g-20 and the RF processor 3g-10. In addition, the control unit 3g-40 records and reads data in the storage unit 3g-40. To this end, the controller 3g-40 may include at least one processor. For example, the controller 3g-40 may include a communication processor (CP) for performing control for communication and an application processor (AP) for controlling a higher layer such as an application program. The control unit 3g-40 may include a multiple connection processing unit 3g-42 which performs a process for operating in the multiple connection mode.
  • CP communication processor
  • AP application processor
  • the control unit 3g-40 may include a multiple connection processing unit 3g-42 which performs a process for operating in the multiple connection mode.
  • 3H is a block diagram illustrating a configuration of a base station according to a third embodiment of the present invention.
  • the base station includes an RF processor 3h-10, a baseband processor 3h-20, a backhaul communication unit 3h-30, a storage unit 3h-40, and a controller 3h-50. It is configured to include.
  • the RF processor 3h-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 3h-10 up-converts the baseband signal provided from the baseband processor 3h-20 into an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 3h-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. In the figure, only one antenna is shown, but the base station may have a plurality of antennas.
  • the RF processor 3h-10 may include a plurality of RF chains.
  • the RF processor 3h-10 may perform beamforming. For the beamforming, the RF processor 3h-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processor may perform a downlink MIMO operation by transmitting one or more layers.
  • the baseband processor 3h-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the radio access technology. For example, during data transmission, the baseband processor 3h-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 3h-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 3h-10. For example, according to the OFDM scheme, during data transmission, the baseband processor 3h-20 generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then IFFT. OFDM symbols are constructed by operation and CP insertion.
  • the baseband processor 3h-20 divides the baseband signal provided from the RF processor 3h-10 in OFDM symbol units and restores signals mapped to subcarriers through an FFT operation. After that, the received bit stream is recovered by demodulation and decoding.
  • the baseband processor 3h-20 and the RF processor 3h-10 transmit and receive signals as described above. Accordingly, the baseband processor 3h-20 and the RF processor 3h-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.
  • the backhaul communication unit 3h-30 provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit 3h-30 converts a bit string transmitted from the base station to another node, for example, an auxiliary base station, a core network, etc., into a physical signal, and converts a physical signal received from the other node into a bit string. Convert to
  • the storage unit 3h-40 stores data such as a basic program, an application program, and setting information for the operation of the base station.
  • the storage unit 3h-40 may store information on a bearer allocated to the connected terminal, a measurement result reported from the connected terminal, and the like.
  • the storage unit 3h-40 may store information that is a criterion for determining whether to provide or terminate multiple connections to the terminal.
  • the storage unit 3h-40 provides stored data at the request of the controller 3h-50.
  • the controller 3h-50 controls the overall operations of the base station. For example, the controller 3h-50 transmits and receives a signal through the baseband processor 3h-20 and the RF processor 3h-10 or through the backhaul communication unit 3h-30. In addition, the control unit 3h-50 records and reads data in the storage unit 3h-40. To this end, the controller 3h-50 may include at least one processor. The control unit 3h-50 may include a multiple connection processing unit 3g-52 which performs processing for operating in the multiple connection mode.
  • the eNB may be used interchangeably with gNB for convenience of description. That is, the base station described as an eNB may represent a gNB.
  • 4A is a diagram illustrating the structure of an LTE system to which the present invention can be applied.
  • a radio access network of an LTE system includes a next-generation base station (Evolved Node B, ENB, Node B, or base station) 4a-05, 4a-10, 4a-15, and 4a-20. It consists of MME (4a-25, Mobility Management Entity) and S-GW (4a-30, Serving-Gateway).
  • the user equipment (UE or UE) 4a-35 connects to the external network through the ENBs 4a-05 to 4a-20 and the S-GW 4a-30.
  • ENBs 4a-05 to 4a-20 correspond to existing Node Bs of the UMTS system.
  • the ENB is connected to the UEs 4a-35 by radio channel and performs a more complicated role than the existing Node B.
  • all user traffic including real-time services such as Voice over IP (VoIP) over the Internet protocol, is serviced through a shared channel, so information on the status of buffers, available transmit power, and channel status of UEs is available. It is necessary to have a device that collects the scheduling, and ENB (4a-05 ⁇ 4a-20) is in charge.
  • One ENB typically controls multiple cells.
  • the LTE system uses orthogonal frequency division multiplexing (hereinafter, referred to as OFDM) in a 20 MHz bandwidth as a radio access technology.
  • OFDM orthogonal frequency division multiplexing
  • AMC adaptive modulation & coding
  • the S-GW 4a-30 is a device for providing a data bearer, and generates or removes a data bearer under the control of the MME 4a-25.
  • the MME is a device that is in charge of various control functions as well as mobility management function for the terminal and is connected to a plurality of base stations.
  • 4b is a diagram illustrating a radio protocol structure in an LTE system to which the present invention can be applied.
  • the wireless protocol of the LTE system is PDCP (Packet Data Convergence Protocol 4b-05, 4b-40), RLC (Radio Link Control 4b-10, 4b-35), MAC (Medium Access) at the UE and ENB, respectively. Control 4b-15, 4b-30).
  • PDCP Packet Data Convergence Protocol 4b-05, 4b-40
  • RLC Radio Link Control 4b-10, 4b-35
  • MAC Medium Access
  • PDCP Packet Data Convergence Protocol (4b-05, 4b-40) is responsible for operations such as IP header compression / restoration.
  • IP header compression / restoration The main functions of PDCP are summarized as follows.
  • Radio link control (hereinafter referred to as RLC) 4b-10 and 4b-35 reconfigure PDCP PDUs (Packet Data Units) to appropriate sizes to perform ARQ operations.
  • RLC Radio link control
  • PDCP PDUs Packet Data Units
  • Protocol error detection (only for AM data transfer)
  • the MACs 4b-15 and 4b-30 are connected to several RLC layer devices configured in one terminal, and multiplex RLC PDUs to MAC PDUs and demultiplex RLC PDUs from MAC PDUs.
  • the main functions of the MAC are summarized as follows.
  • the physical layers 4b-20 and 4b-25 channel-code and modulate upper layer data, make the OFDM symbols and transmit them to the wireless channel, or demodulate, channel decode, and transmit the OFDM symbols received through the wireless channel to the upper layer. Do the operation.
  • 4c is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention can be applied.
  • the radio access network of the next generation mobile communication system (hereinafter referred to as NR or 5G) is shown as a next generation base station (New Radio Node B, NR gNB or NR base station) 4c-10 and NR CN (4c). -05, New Radio Core Network).
  • the user terminal (New Radio User Equipment, NR UE or terminal) 4c-15 connects to the external network via NR gNB 4c-10 and NR CN 4c-05.
  • the NR gNB 4c-10 corresponds to an eNB (Evolved Node B) of the existing LTE system.
  • the NR gNB is connected to the NR UE 4c-15 in a radio channel and may provide superior service than the existing Node B.
  • a device that collects and schedules state information such as buffer states, available transmit power states, and channel states of UEs is required. (4c-10) is in charge.
  • One NR gNB typically controls multiple cells.
  • the NR CN 4c-05 performs mobility support, bearer setup, QoS setup, and the like.
  • the NR CN is a device that is in charge of various control functions as well as mobility management function for a terminal and is connected to a plurality of base stations.
  • the next generation mobile communication system can be linked with the existing LTE system, NR CN is connected to the MME (4c-25) through the network interface.
  • the MME is connected to the eNB (4c-30) which is an existing base station.
  • 4d is a diagram illustrating a radio protocol structure of a next generation mobile communication system to which the present invention can be applied.
  • the radio protocols of the next generation mobile communication system are NR PDCP (4d-05, 4d-40), NR RLC (4d-10, 4d-35), and NR MAC (4d-15) at the terminal and the NR base station, respectively. , 4d-30).
  • the main functions of NR PDCP (4d-05, 4d-40) may include some of the following functions.
  • the order reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer based on a PDCP sequence number, and delivering data to an upper layer in a reordered order. It may include, and may include the ability to rearrange the order to record the missing PDCP PDUs, may include the ability to report the status of the missing PDCP PDUs to the transmitting side, missing PDCP PDUs It may include a function for requesting a retransmission for.
  • the main functions of the NR RLCs 4d-10 and 4d-35 may include some of the following functions.
  • In-sequence delivery of the NR RLC device refers to a function of sequentially delivering the RLC SDUs received from the lower layer to the upper layer, and the original RLC SDU is divided into several RLC SDUs and received. If so, it may include a function of reassembling and delivering the same, and may include a function of rearranging the received RLC PDUs based on the RLC sequence number (PD) SN or PDCP sequence number (SN), May include a function of recording lost RLC PDUs, may include a function of reporting status of lost RLC PDUs to the sender, and may include a function of requesting retransmission of lost RLC PDUs.
  • PD RLC sequence number
  • SN PDCP sequence number
  • the RLC PDUs may be processed in the order of receiving the RLC PDUs (regardless of the sequence number and sequence number), and delivered to the PDCP device in an out-of sequence delivery.
  • Received segments stored in the buffer or to be received later may be reconfigured into an intact RLC PDU, and then processed and delivered to the PDCP device.
  • the NR RLC layer may not include a concatenation function and may perform the function in the NR MAC layer or replace it with a multiplexing function of the NR MAC layer.
  • Out-of-sequence delivery of the NR RLC device refers to a function of directly delivering the RLC SDUs received from the lower layer to the upper layer regardless of the order, and the original one RLC SDU has several RLCs. When received divided into SDUs, it may include a function of reassembling and forwarding, and storing the lost RLC PDUs by storing and ordering the RLC SN or PDCP SN of the received RLC PDUs Can be.
  • the NR MACs 4d-15 and 4d-30 may be connected to several NR RLC layer devices configured in one terminal, and a main function of the NR MAC may include some of the following functions.
  • the NR PHY layer (4d-20, 4d-25) channel-codes and modulates the higher layer data, transforms it into OFDM symbols and transmits it over the wireless channel, or demodulates and channel decodes the OFDM symbols received over the radio channel to the higher layer.
  • the transfer operation can be performed.
  • the mobility of the terminal may be managed based on a beam, and the connection with a plurality of base stations is provided to provide a high data rate and stable service.
  • the present invention proposes and describes a method and apparatus for redundantly transmitting control data to different base stations or different connections in order to increase reliability when transmitting control signaling on the uplink of a terminal.
  • FIG. 4E is a diagram illustrating a procedure for configuring UEs and bearers by each UE in a next generation mobile communication system of the present invention.
  • FIG. 4E is a diagram illustrating a procedure in which a terminal establishes a connection with a network and sets up devices (entities) of each layer in order to transmit and receive data.
  • the terminal (4e-01, idle mode UE) that is not currently connected to perform the RRC connection establishment process with the LTE base station or NR base station 4e-02 when data to be transmitted is generated.
  • the terminal establishes reverse transmission synchronization with the base station through a random access procedure and transmits an RRCConnectionRequest message to the base station (4e-05).
  • the RRCConnectionRequest message contains an identifier of the terminal and a reason for establishing a connection.
  • the base station transmits an RRCConnectionSetup message so that the terminal establishes an RRC connection (4e-10).
  • the RRCConnectionSetup message may store RRC connection configuration information, setting information of each layer, and the like. That is, it may include configuration information on the PHY or NR PHY device, MAC or NR MAC device, RLC or NR RLC device, PDCP or NR PDCP device, the functions supported by the layer devices (Fig. 4b or 4d) Among the described layer-specific functions) may include information indicating a setting for specific functions.
  • the RRCConnectionSetup message may include information for setting interworking between the LTE base station (or NR base station) and the NR base station.
  • the information for setting the interworking between the LTE base station (or NR base station) and the NR base station includes information indicating a 3C type or a 1A type, information on each layer device according to each type, SRB / DRB bearer setting information, and the like.
  • it may include an indication of which base station to start transmission from which MAC device corresponding to the base station first.
  • the RRC connection is also called a signaling radio bearer (SRB) and is used for transmitting and receiving an RRC message, which is a control message between the terminal and the base station.
  • SRB signaling radio bearer
  • the UE After establishing the RRC connection, the UE transmits an RRCConnetionSetupComplete message to the base station (4e-15).
  • the base station transmits an RRCConnectionReconfiguration message to the terminal to configure a data radio bearer (DRB) (4e-20).
  • the RRCConnectionReconfiguration message may store RRC connection configuration information, configuration information of each layer, and the like.
  • the RRCConnectionReconfiguration message may include information for configuring interworking between the LTE base station (or NR base station) and the NR base station.
  • the information for setting the interworking between the LTE base station (or NR base station) and the NR base station includes information indicating a 3C type or a 1A type, information on each layer device according to each type, SRB / DRB bearer setting information, and the like.
  • it may include an indication of which base station to start transmission from which MAC device corresponding to the base station first.
  • the RRCConnectionReconfiguration message may include configuration information of the DRB to which user data is to be processed.
  • the UE applies the information included in the RRCConnectionReconfiguration message to set up a DRB, configure functions of each layer, and transmit an RRCConnectionReconfigurationComplete message to the base station (4e-25).
  • the terminal transmits and receives data with the base station (4e-30).
  • the base station may re-establish an RRCConnectionReconfiguration message to the terminal if necessary (4e-35) to reset configuration information of each layer of the terminal.
  • the RRCConnectionReconfiguration message may store RRC connection configuration information, configuration information of each layer, and the like. That is, it may include configuration information on the PHY or NR PHY device, MAC or NR MAC device, RLC or NR RLC device, PDCP or NR PDCP device, the functions supported by the layer devices (Fig. 4b or 4d) Among the described layer-specific functions) may include information indicating a setting for specific functions.
  • the RRCConnectionReconfiguration message may include information for configuring interworking between the LTE base station (or NR base station) and the NR base station.
  • the information for setting the interworking between the LTE base station (or NR base station) and the NR base station includes information indicating a 3C type or a 1A type, information on each layer device according to each type, SRB / DRB bearer setting information, and the like.
  • it may include an indication of which base station to start transmission from which MAC device corresponding to the base station first.
  • the UE Upon completing the configuration of each layer device according to the information included in the RRCConnectionReconfiguration message, the UE transmits an RRCConnectionReconfigurationComplete message to the base station (4e-40).
  • the radio bearer is a logical path formed to provide appropriate QoS and is composed of one PDCP device and one or two RLC devices.
  • SRBs that can be configured in one terminal are as follows.
  • SRB0 This is a radio bearer that processes Common Control Channel (CCCH) control messages, and security is not applied. Only packets of a certain size are transmitted on the uplink. The PDCP header and the RLC header are not added to the RRC control message transmitted and received to the SRB0. In other words, the RRC control message is delivered to the MAC as it is without additional processing in PDCP and RLC. In addition, a message authorization code for integrity (MAC-I) for integrity protection is not attached to the downlink RRC control message transmitted and received to SRB0.
  • MAC-I message authorization code for integrity
  • SRB1 A radio bearer for processing a Dedicated Control Channel (DCCH) control message, MAC-I is attached to data transmitted and received through SRB1, and the MAC-I is added by the PDCP layer.
  • DCCH Dedicated Control Channel
  • SRB2 A radio bearer that processes a dedicated control channel (DCCH) control message, and a control message having a lower priority than that of a control message transmitted and received through SRB1 is transmitted and received through SRB2.
  • DCCH dedicated control channel
  • the secondary base station (SeNB) is a bearer that can be configured to send a control message directly to the terminal without passing through the master base station (MeNB), and may use a DCCH.
  • SRB0 can be used without a separate configuration procedure, whereas SRB1 is configured during RRC connection establishment, and SRB2 or SRB3 is configured during RRC connection reconfiguration.
  • 4F is a diagram illustrating a dual connectivity scenario considered by a fourth embodiment of the present invention in a next generation mobile communication system.
  • the next-generation mobile communication system terminal establishes a dual connection with the LTE base station and the next-generation communication system base station to receive service.
  • a next-generation mobile communication system base station manages a connection as a master (Master, 4f-05) and considers a scenario in which an LTE system supports connection as a secondary (Secondary, 4f-10).
  • the master base station generates user plane data or control plane data generated by the PDCP device 4f-15 to generate the RLC device 4f-20 of the master base station and the RLC device of the secondary base station ( 4f-30) so that data can be delivered through the master base station and the secondary base station.
  • the terminal can transmit data with the network at a higher data rate.
  • the UE may perform redundant transmission for user data or control data by connecting the master base station and connecting the secondary base station. That is, the PDCP device 4f-15 of the terminal may transmit the same data to the RLC device 4f-20 for the master base station and the RLC device 4f-30 for the secondary base station.
  • the bearer may perform duplicate transmission when there is an indication for a specific data, for example, when an indicator is included in a PDCP header or when an indication is made at a higher layer (RRC layer). It may be the case that the network has set up, or is determined by the terminal.
  • the duplicate transmission can be applied to the user data, it can also be applied to the control data. That is, the present invention may be applied to a data radio bearer (DRB) and a controlling radio bearer (SRB).
  • DRB data radio bearer
  • SRB0 uses CCCH (Common Control Channel) and is used for system information and paging, so it is not suitable for redundant transmission.
  • SRB1 and SRB2 use dedicated control channels (DCCHs) and are also used in next-generation mobile communication systems and LTE systems, and thus are suitable bearers for performing redundant transmission.
  • SRB3 may not be suitable for performing redundant transmission since the secondary base station may be defined as a bearer for directly transmitting a control signal to a terminal in a next generation mobile communication system. Therefore, SRB1 and SRB2 are suitable for the application of the redundant transmission technique to the control signal.
  • the fourth embodiment for applying the redundant transmission technique is as follows.
  • the terminal When the PDCP SDU for redundant transmission occurs in the PDCP device, the terminal transmits to the first MAC device (MAC device for the master base station, 4f-25) or the second MAC device (MAC device for the secondary base station, 4f-35). It is necessary to inform that there is data available for transmission.
  • the duplicated packets are not allowed to be simultaneously transmitted through the master base station connection and the secondary base station connection. Because the transmission power limit of the terminal is limited, when data is repeatedly transmitted to the master base station and the secondary base station at the same time, the transmission power for each transmission is consumed in the terminal, and thus only low transmission power can be transmitted.
  • the terminal when the terminal transmits the duplicated packet at the maximum transmission power, the terminal transmits the data to the master base station or the secondary base station one at a time without transmitting them simultaneously.
  • This data requires high reliability, and if it is transmitted to two base stations at different times at the maximum transmission power at a different transmission time than at the same time with low transmission power, the diversity gain ( diversity gain).
  • the terminal may inform one of the first MAC device and the second MAC device that there is data available for transmission according to a predetermined rule.
  • the predetermined rule may be to select an assigned MAC device so that a transmission resource for scheduling request (SR) can be requested earlier in time between the first MAC device and the second MAC device.
  • SR transmission resource for scheduling request
  • it may first request a MAC device set by the network to which MAC device to transmit first (4e-10, 4e-20, 4e-35 in FIG. 4e).
  • the MAC device connected to the master base station may first notify that there is data for data transmission.
  • a base station preset among the two base stations may perform a random access procedure.
  • the MAC device notified that there is data for transmission triggers a regular BSR (Regular BSR) in order to request uplink transmission resources from a master base station or a secondary base station corresponding to the MAC device. That is, the regular BSR requests scheduling using a SR (Scheduling Request) transmission resource, the terminal receives the uplink transmission resources from the base station and sends a regular BSR, the base station is a certain amount of data to be transmitted by the terminal through the BSR After determining the degree, the terminal allocates uplink transmission resources. In case of receiving the uplink transmission resource, the terminal configures and transmits a MAC PDU using data different from data to be transmitted in the redundant transmission.
  • SR Service Request
  • the MAC device or the PDCP device 4f-15 corresponds to another master or secondary base station that has not yet performed transmission for redundant transmission. Notify that there is data available for transmission. Then, the MAC device notified that there is data for transmission triggers a regular BSR (Regular BSR) in order to request uplink transmission resources from a master base station or a secondary base station corresponding to the MAC device.
  • a regular BSR Regular BSR
  • the regular BSR requests scheduling using a SR (Scheduling Request) transmission resource
  • the terminal receives the uplink transmission resources from the base station and sends a regular BSR
  • the base station is a certain amount of data to be transmitted by the terminal through the BSR
  • the terminal allocates uplink transmission resources.
  • the terminal configures and transmits a MAC PDU using data different from data to be transmitted in the redundant transmission.
  • the terminal may not perform the redundant transmission for the data to be duplicated. (If it has already been successfully delivered, performing another transmission would waste transmission resources and will be discarded at the receiving end anyway).
  • the response of the successful transmission may be a case where the HARQ ACK is received by the MAC device or a case where the RLC ACK is received by the RLC device.
  • the UE may record whether the transmission is performed to the master base station or the secondary base station by defining a new variable for the data for redundant transmission (PDCP SDU). For example, by assigning 2 bits to the data for redundant transmission, a value of 0/1 of each bit may indicate whether transmission has been performed to the master base station or the secondary base station.
  • PDCP SDU data for redundant transmission
  • the UE may transmit data for redundant transmission of the PDCP device to the lower layer device after the MAC device receives the uplink transmission resource in connection with the LTE base station.
  • the PDCP device delivers the data for the redundant transmission to the lower layer device before the MAC device receives the uplink transmission resource to perform pre-processing up to the MAC SDU. Can be.
  • the fourth embodiment for applying the redundant transmission technique in the scenario of FIG. 4F is as follows.
  • an embodiment of 4-2 for applying a redundant transmission technique is as follows.
  • the terminal transmits to the first MAC device (MAC device for the master base station, 4f-25) or the second MAC device (MAC device for the secondary base station, 4f-35). It is necessary to inform that there is data available for transmission.
  • the duplicated packet is simultaneously transmitted through the master base station connection and the secondary base station connection. That is, when data for redundant transmission (PDCP SDU) is configured in the PDCP device, the PDCP device informs that both the first MAC device and the second MAC device have data available for transmission.
  • the purpose of embodiment 4-2 is to transmit data in duplicate as soon as possible, and as described above, when the first MAC device and the second MAC device request uplink transmission resources from the master base station and the secondary base station, respectively. Therefore, since the transmission resources are less likely to be allocated at the same time, the purpose is to quickly perform the scheduling request to the two base stations. Although the uplink transmission resources are allocated at the same time, the simultaneous transmission is allowed even if the transmission power is divided and transmitted according to the embodiment 4-1.
  • the terminal may inform that both the first MAC device and the second MAC device have data available for transmission. Then, the MAC device notified that there is data for transmission triggers a regular BSR (Regular BSR) in order to request uplink transmission resources from a master base station or a secondary base station corresponding to the MAC device. That is, the regular BSR requests scheduling using a SR (Scheduling Request) transmission resource, the terminal receives the uplink transmission resources from the base station and sends a regular BSR, the base station is a certain amount of data to be transmitted by the terminal through the BSR After determining the degree, the terminal allocates uplink transmission resources. In case of receiving the uplink transmission resource, the terminal configures and transmits a MAC PDU using data different from data to be transmitted in the redundant transmission. If the base station has not allocated the SR transmission resources, the random access procedure may be performed.
  • SR Service Request
  • the terminal may not perform the redundant transmission for the data to be duplicated. (If it has already been successfully delivered, performing another transmission would waste transmission resources and will be discarded at the receiving end anyway).
  • the response of the successful transmission may be a case where the HARQ ACK is received by the MAC device or a case where the RLC ACK is received by the RLC device.
  • the UE may record whether the transmission is performed to the master base station or the secondary base station by defining a new variable for the data for redundant transmission (PDCP SDU). For example, by assigning 2 bits to the data for redundant transmission, a value of 0/1 of each bit may indicate whether transmission has been performed to the master base station or the secondary base station.
  • PDCP SDU data for redundant transmission
  • the UE may transmit data for redundant transmission of the PDCP device to the lower layer device after the MAC device receives the uplink transmission resource in connection with the LTE base station.
  • the PDCP device delivers the data for the redundant transmission to the lower layer device to perform pre-processing up to the MAC SDU. Can be.
  • the UE may trigger the regular BSR and perform the SR only for the MAC device connected to the next generation mobile communication system base station. This is because SRB3 is defined only in the next generation mobile communication system and is not defined in the LTE system.
  • SRB1 and SRB2 transmit and receive data by applying different security keys from SRB3.
  • SRB1 and SRB2 can be used in common in LTE system and next generation mobile communication system
  • SRB3 is mainly bearer only for next generation mobile communication system, and the main purpose is to pass control signal through master base station when next generation mobile communication system base station is secondary base station. It is necessary to use a different security key because it is intended to be delivered directly to the terminal without using it. That is, since the security key of the secondary base station can be applied instead of the security key of the master base station because it does not pass through the master base station, SRB1 and SRB2 may use different security keys from SRB3.
  • 4G is a diagram illustrating another dual access scenario considered by the fourth embodiment of the present invention in a next generation mobile communication system.
  • next-generation mobile communication system terminal establishes a dual connection with the next-generation communication system base station and another next-generation mobile communication system base station, and receives service.
  • a next-generation mobile communication system base station manages a connection as a master (Master, 4g-05) and another next-generation mobile communication system as a secondary (Secondary, 4g-10).
  • Master 4g-05
  • secondary 4g-10
  • embodiments of 4-1 and 4-2 described with reference to FIG. 4F may be applied in the same manner.
  • 4h is a diagram illustrating an operation of a terminal to which the fourth embodiment is applied in the present invention.
  • the UE when a PDCP SDU for redundant transmission occurs in the PDCP device (4h-05), the UE transmits to the first MAC device (MAC device for the master base station) or the second MAC device (MAC device for the secondary base station). It is necessary to inform that there is data available for transmission.
  • the duplicated packets are not allowed to be simultaneously transmitted through the master base station connection and the secondary base station connection.
  • the UE may inform one of the first MAC device and the second MAC device that there is data available for transmission according to a predetermined rule (4h-10, 4h-15).
  • the predetermined rule may be to select an assigned MAC device so that a transmission resource for scheduling request (SR) can be requested earlier in time between the first MAC device and the second MAC device.
  • SR transmission resource for scheduling request
  • it may first request a MAC device set by the network to which MAC device to transmit first (4e-10, 4e-20, 4e-35 in FIG. 4e).
  • the MAC device connected to the master base station may first notify that there is data for data transmission.
  • a base station preset among the two base stations may perform a random access procedure.
  • the MAC device notified that there is data for transmission triggers a regular BSR (Regular BSR) to request uplink transmission resources from the master base station or the secondary base station corresponding to the MAC device (4h). -20). That is, the regular BSR requests scheduling using a SR (Scheduling Request) transmission resource, the terminal receives the uplink transmission resources from the base station and sends a regular BSR, the base station is a certain amount of data to be transmitted by the terminal through the BSR After determining the degree, the terminal allocates uplink transmission resources. In case of receiving the uplink transmission resource, the terminal configures and transmits a MAC PDU using data different from the data to be transmitted in the redundant transmission (4h-25).
  • SR Service Request
  • the MAC device or the PDCP device 4f-15 corresponds to another master or secondary base station that has not yet performed transmission for redundant transmission. Notify that there is data available for transmission (4h-30). Then, the MAC device notified that there is data for transmission triggers a regular BSR (Regular BSR) in order to request uplink transmission resources from a master base station or a secondary base station corresponding to the MAC device.
  • a regular BSR Regular BSR
  • the regular BSR requests scheduling using a SR (Scheduling Request) transmission resource
  • the terminal receives the uplink transmission resources from the base station and sends a regular BSR
  • the base station is a certain amount of data to be transmitted by the terminal through the BSR
  • the terminal allocates uplink transmission resources.
  • the terminal configures and transmits a MAC PDU using data different from data to be transmitted in the redundant transmission.
  • the terminal may not perform the redundant transmission for the data to be duplicated. (If it has already been successfully delivered, performing another transmission would waste transmission resources and will be discarded at the receiving end anyway).
  • Successful transmission of the response may be a case of receiving an HARQ ACK from a MAC device or a case of receiving an RLC ACK from an RLC device.
  • 4i is a diagram illustrating the operation of a terminal to which the fourth embodiment of the present invention is applied.
  • the PDCP SDU for redundant transmission occurs in the PDCP device (4i-05)
  • data is transmitted to the first MAC device (MAC device for the master base station) or the second MAC device (MAC device for the secondary base station). It is necessary to inform that there is available for transmission (4i-10).
  • the duplicated packet is simultaneously transmitted through the master base station connection and the secondary base station connection. That is, when data for redundant transmission (PDCP SDU) is configured in the PDCP device, the PDCP device informs that both the first MAC device and the second MAC device have data available for transmission.
  • the purpose of embodiment 4-2 is to transmit data in duplicate as soon as possible, and as described above, when the first MAC device and the second MAC device request uplink transmission resources from the master base station and the secondary base station, respectively. Therefore, since the transmission resources are less likely to be allocated at the same time, the purpose is to quickly perform the scheduling request to the two base stations. Although the uplink transmission resources are allocated at the same time, the simultaneous transmission is allowed even if the transmission power is divided and transmitted according to the first embodiment.
  • the terminal may inform that both the first MAC device and the second MAC device have data available for transmission (4i-10). Then, the MAC device notified that there is data for transmission triggers a regular BSR (Regular BSR) to request uplink transmission resources from a master base station or a secondary base station corresponding to the MAC device (4i ⁇ ). 15). That is, the regular BSR requests scheduling using a SR (Scheduling Request) transmission resource, the terminal receives the uplink transmission resources from the base station and sends a regular BSR, the base station is a certain amount of data to be transmitted by the terminal through the BSR After determining the degree, the terminal allocates uplink transmission resources. In case of receiving the uplink transmission resource, the terminal configures and transmits a MAC PDU using data different from the data to be transmitted in the redundant transmission (4i-20). If the base station has not allocated the SR transmission resources, the random access procedure may be performed.
  • SR Service-Time Transport Stream
  • the terminal may not perform the redundant transmission for the data to be duplicated. (If it has already been successfully delivered, performing another transmission would waste transmission resources and will be discarded at the receiving end anyway).
  • Successful transmission of the response may be a case of receiving an HARQ ACK from a MAC device or a case of receiving an RLC ACK from an RLC device.
  • 4J illustrates a structure of a terminal to which the fourth embodiment of the present invention can be applied.
  • the terminal includes a radio frequency (RF) processor 4j-10, a baseband processor 4j-20, a storage 4j-30, and a controller 4j-40. .
  • RF radio frequency
  • the RF processor 4j-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 4j-10 up-converts the baseband signal provided from the baseband processor 4j-20 into an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 4j-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. Can be. In the figure, only one antenna is shown, but the terminal may include a plurality of antennas.
  • the RF processor 4j-10 may include a plurality of RF chains.
  • the RF processor 4j-10 may perform beamforming. For the beamforming, the RF processor 4j-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processor may perform MIMO, and may receive multiple layers when performing the MIMO operation.
  • the RF processor 4j-10 may perform reception beam sweeping by appropriately setting a plurality of antennas or antenna elements under the control of the controller, or may adjust the direction and beam width of the reception beam so that the reception beam is coordinated with the transmission beam. have.
  • the baseband processor 4j-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the system. For example, during data transmission, the baseband processor 4j-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 4j-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 4j-10. For example, in accordance with an orthogonal frequency division multiplexing (OFDM) scheme, during data transmission, the baseband processor 4j-20 generates complex symbols by encoding and modulating a transmission bit stream and generates the complex symbols by subcarriers.
  • OFDM orthogonal frequency division multiplexing
  • OFDM symbols are configured through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • the baseband processor 4j-20 divides the baseband signal provided from the RF processor 4j-10 into OFDM symbol units and subcarriers through fast Fourier transform (FFT) operations. After recovering the mapped signals, the received bit stream is recovered through demodulation and decoding.
  • FFT fast Fourier transform
  • the baseband processor 4j-20 and the RF processor 4j-10 transmit and receive signals as described above. Accordingly, the baseband processor 4j-20 and the RF processor 4j-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. Furthermore, at least one of the baseband processor 4j-20 and the RF processor 4j-10 may include a plurality of communication modules to support different radio access technologies. In addition, at least one of the baseband processor 4j-20 and the RF processor 4j-10 may include different communication modules to process signals of different frequency bands. For example, the different radio access technologies may include an LTE network, an NR network, and the like. In addition, the different frequency bands may include a super high frequency (SHF) (eg 2.5 GHz, 5 Ghz) band and a millimeter wave (eg 60 GHz) band.
  • SHF super high frequency
  • 60 GHz millimeter wave
  • the storage unit 4j-30 stores data such as a basic program, an application program, and setting information for the operation of the terminal.
  • the storage unit 4j-30 provides stored data at the request of the controller 4j-40.
  • the controller 4j-40 controls overall operations of the terminal.
  • the controller 4j-40 transmits and receives signals through the baseband processor 4j-20 and the RF processor 4j-10.
  • the control unit 4j-40 also records and reads data in the storage unit 4j-40.
  • the controller 4j-40 may include at least one processor.
  • the controller 4j-40 may include a communication processor (CP) for performing control for communication and an application processor (AP) for controlling a higher layer such as an application program.
  • the control unit 4j-40 may include a multiple connection processing unit 4j-42 which performs processing for operating in the multiple connection mode.
  • 4K is a block diagram of a base station in a wireless communication system to which a fourth embodiment of the present invention can be applied.
  • the base station includes an RF processor 4k-10, a baseband processor 4k-20, a backhaul communication unit 4k-30, a storage unit 4k-40, and a controller 4k-50. It is configured to include.
  • the RF processor 4k-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 4k-10 up-converts the baseband signal provided from the baseband processor 4k-20 to an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 4k-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. In the figure, only one antenna is shown, but the base station may have a plurality of antennas.
  • the RF processor 4k-10 may include a plurality of RF chains.
  • the RF processor 4k-10 may perform beamforming. For the beamforming, the RF processor 4k-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processor may perform a downlink MIMO operation by transmitting one or more layers.
  • the baseband processor 4k-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the radio access technology. For example, during data transmission, the baseband processor 4k-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 4k-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 4k-10. For example, according to the OFDM scheme, during data transmission, the baseband processor 4k-20 generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then IFFT. OFDM symbols are constructed by operation and CP insertion.
  • the baseband processor 4k-20 divides the baseband signal provided from the RF processor 4k-10 in OFDM symbol units and restores signals mapped to subcarriers through an FFT operation. After that, the received bit stream is recovered by demodulation and decoding.
  • the baseband processor 4k-20 and the RF processor 4k-10 transmit and receive signals as described above. Accordingly, the baseband processor 4k-20 and the RF processor 4k-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.
  • the communication unit 4k-30 provides an interface for communicating with other nodes in the network.
  • the storage unit 4k-40 stores data such as a basic program, an application program, and setting information for the operation of the base station.
  • the storage unit 4k-40 may store information on a bearer allocated to the connected terminal, a measurement result reported from the connected terminal, and the like.
  • the storage unit 4k-40 may store information that is a criterion for determining whether to provide or terminate multiple connections to the terminal.
  • the storage unit 4k-40 provides stored data at the request of the controller 4k-50.
  • the controller 4k-50 controls the overall operations of the base station. For example, the controller 4k-50 transmits and receives a signal through the baseband processor 4k-20 and the RF processor 4k-10 or through the backhaul communication unit 4k-30. In addition, the controller 4k-50 records and reads data in the storage unit 4k-40. To this end, the controller 4k-50 may include at least one processor.
  • the control unit 4k-50 may include a multiple connection processing unit 4k-52 which performs processing for operating in the multiple connection mode.
  • 5A is a diagram illustrating the structure of an LTE system to which the present invention can be applied.
  • a radio access network of an LTE system is illustrated with a next generation base station (Evolved Node B, ENB, Node B or base station) 5a-05, 5a-10, 5a-15, and 5a-20. It consists of MME (5a-25, Mobility Management Entity) and S-GW (5a-30, Serving-Gateway).
  • the user equipment (UE or UE) 5a-35 connects to the external network through the ENBs 5a-05 to 5a-20 and the S-GW 5a-30.
  • the ENBs 5a-05 to 5a-20 correspond to existing Node Bs of the UMTS system.
  • the ENB is connected to the UEs 5a-35 by a radio channel and performs a more complicated role than the existing Node B.
  • all user traffic including real-time services such as Voice over IP (VoIP) over the Internet protocol, is serviced through a shared channel, so information on the status of buffers, available transmit power, and channel status of UEs is available. It is necessary to have a device that collects the scheduling and ENB (5a-05 ⁇ 5a-20) is in charge.
  • One ENB typically controls multiple cells.
  • the LTE system uses orthogonal frequency division multiplexing (hereinafter, referred to as OFDM) in a 20 MHz bandwidth as a radio access technology.
  • OFDM orthogonal frequency division multiplexing
  • AMC adaptive modulation & coding
  • the S-GW 5a-30 is a device that provides a data bearer, and generates or removes a data bearer under the control of the MME 5a-25.
  • the MME is a device that is in charge of various control functions as well as mobility management function for the terminal and is connected to a plurality of base stations.
  • 5b is a diagram showing a radio protocol structure in an LTE system to which the present invention can be applied.
  • a wireless protocol of an LTE system includes PDCP (Packet Data Convergence Protocol 5b-05, 5b-40), RLC (Radio Link Control 5b-10, 5b-35), and MAC (Medium Access) at a terminal and an ENB, respectively. Control 5b-15, 5b-30).
  • PDCP Packet Data Convergence Protocol 5b-05, 5b-40
  • RLC Radio Link Control 5b-10, 5b-35
  • MAC Medium Access
  • PDCP Packet Data Convergence Protocol
  • 5b-05, 5b-40 is responsible for operations such as IP header compression / restoration.
  • the main functions of PDCP are summarized as follows.
  • Radio link control (hereinafter referred to as RLC) 5b-10 and 5b-35 may reconfigure PDCP PDUs (Packet Data Units) to appropriate sizes to perform ARQ operations.
  • PDCP PDUs Packet Data Units
  • Protocol error detection (only for AM data transfer)
  • the MACs 5b-15 and 5b-30 are connected to several RLC layer devices configured in one terminal, and multiplex RLC PDUs to MAC PDUs and demultiplex RLC PDUs from MAC PDUs.
  • the main functions of the MAC are summarized as follows.
  • the physical layers 5b-20 and 5b-25 channel-code and modulate upper layer data, make the OFDM symbols and transmit them to the wireless channel, or demodulate, channel decode, and transmit the OFDM symbols received through the wireless channel to the upper layer. Do the operation.
  • 5C is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention can be applied.
  • the radio access network of a next generation mobile communication system may include a next generation base station (New Radio Node B, NR gNB or NR base station) 5c-10 and an NR CN (5c). -05, New Radio Core Network).
  • the user terminal (New Radio User Equipment, NR UE or terminal) 5c-15 connects to the external network via NR gNB 5c-10 and NR CN 5c-05.
  • the NR gNB 5c-10 corresponds to an eNB (Evolved Node B) of the existing LTE system.
  • the NR gNB is connected to the NR UE 5c-15 in a radio channel and may provide superior service than the existing Node B.
  • a device that collects and schedules state information such as buffer states, available transmit power states, and channel states of UEs is required.
  • (5c-10) is in charge.
  • One NR gNB typically controls multiple cells.
  • the NR CN 5c-05 performs mobility support, bearer setup, QoS setup, and the like.
  • the NR CN is a device that is in charge of various control functions as well as mobility management function for a terminal and is connected to a plurality of base stations.
  • the next generation mobile communication system can be linked to the existing LTE system, NR CN is connected to the MME (5c-25) through the network interface.
  • the MME is connected to the eNB (5c-30) which is an existing base station.
  • 5d is a diagram illustrating a radio protocol structure of a next generation mobile communication system to which the present invention can be applied.
  • the radio protocol of the next generation mobile communication system includes NR PDCP (5d-05, 5d-40), NR RLC (5d-10, 5d-35), and NR MAC (5d-15) at a terminal and an NR base station, respectively. , 5d-30).
  • the main functions of the NR PDCP (5d-05, 5d-40) may include some of the following functions.
  • the order reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer based on a PDCP sequence number, and delivering data to an upper layer in a reordered order. It may include, and may include the ability to rearrange the order to record the missing PDCP PDUs, may include the ability to report the status of the missing PDCP PDUs to the transmitting side, missing PDCP PDUs It may include a function for requesting a retransmission for.
  • the main functions of the NR RLCs 5d-10 and 5d-35 may include some of the following functions.
  • In-sequence delivery of the NR RLC device refers to a function of sequentially delivering the RLC SDUs received from the lower layer to the upper layer, and the original RLC SDU is divided into several RLC SDUs and received. If so, it may include a function of reassembling and delivering the same, and may include a function of rearranging the received RLC PDUs based on the RLC sequence number (PD) SN or PDCP sequence number (SN), May include a function of recording lost RLC PDUs, may include a function of reporting status of lost RLC PDUs to the sender, and may include a function of requesting retransmission of lost RLC PDUs.
  • PD RLC sequence number
  • SN PDCP sequence number
  • the RLC PDUs may be processed in the order of receiving the RLC PDUs (regardless of the sequence number and sequence number), and delivered to the PDCP device in an out-of sequence delivery.
  • Received segments stored in the buffer or to be received later may be reconfigured into an intact RLC PDU, and then processed and delivered to the PDCP device.
  • the NR RLC layer may not include a concatenation function and may perform the function in the NR MAC layer or replace it with a multiplexing function of the NR MAC layer.
  • Out-of-sequence delivery of the NR RLC device refers to a function of directly delivering the RLC SDUs received from the lower layer to the upper layer regardless of the order, and the original one RLC SDU has several RLCs. When received divided into SDUs, it may include a function of reassembling and forwarding, and storing the lost RLC PDUs by storing and ordering the RLC SN or PDCP SN of the received RLC PDUs Can be.
  • the NR MACs 5d-15 and 5d-30 may be connected to several NR RLC layer devices configured in one terminal, and a main function of the NR MAC may include some of the following functions.
  • the NR PHY layer (5d-20, 5d-25) channel-codes and modulates the higher layer data, transforms it into OFDM symbols and transmits it over the wireless channel, or demodulates and channel decodes the OFDM symbols received over the radio channel to the higher layer.
  • the transfer operation can be performed.
  • FIG. 5E is a diagram illustrating a procedure for configuring UEs and bearers by each UE in a next generation mobile communication system of the present invention.
  • FIG. 5E is a diagram illustrating a procedure in which a terminal establishes a connection with a network and sets up devices (entities) of each layer in order to transmit and receive data.
  • the terminal 5e-01 (hereinafter idle mode UE) that is not currently connected to perform an RRC connection establishment process with the LTE base station or the NR base station 5e-02 when data to be transmitted is generated.
  • the terminal establishes reverse transmission synchronization with the base station through a random access procedure and transmits an RRCConnectionRequest message to the base station (5e-05).
  • the RRCConnectionRequest message contains an identifier of the terminal and a reason for establishing a connection.
  • the base station transmits an RRCConnectionSetup message so that the terminal establishes an RRC connection (5e-10).
  • the RRCConnectionSetup message may store RRC connection configuration information, setting information of each layer, and the like. That is, it may include configuration information on the PHY or NR PHY device, MAC or NR MAC device, RLC or NR RLC device, PDCP or NR PDCP device, the functions supported by the layer devices (FIG. 5b or 5d) Among the described layer-specific functions) may include information indicating a setting for specific functions.
  • the RRCConnectionSetup message also includes mapping information between logical channels (LCHs) and logical channel groups (LCGs), information about logical channels or logical channel groups to which a BSR_TRIGGER_COUNT value is applied, and triggers BSR.
  • LCHs logical channels
  • LCGs logical channel groups
  • BSR_TRIGGER_COUNT information about logical channels or logical channel groups to which a BSR_TRIGGER_COUNT value is applied
  • BSR_TRIGGER_COUNT Information about a threshold for comparing BSR_TRIGGER_COUNT values, mapping information for logical channels or logical channel groups and TTI, and information indicating whether or not URLLC service for logical channels or logical channel groups (indication) and the like.
  • the RRC connection is also called a signaling radio bearer (SRB) and is used for transmitting and receiving an RRC message, which is a control message between the terminal and the base station.
  • SRB signaling radio bearer
  • the UE After establishing the RRC connection, the UE transmits an RRCConnetionSetupComplete message to the base station (5e-15).
  • the base station transmits an RRCConnectionReconfiguration message to the terminal to configure a data radio bearer (DRB) (5e-20).
  • DRB data radio bearer
  • the RRCConnectionReconfiguration message may store RRC connection configuration information, configuration information of each layer, and the like.
  • the RRCConnectionReconfiguration message may also include mapping information between logical channels (LCHs) and logical channel groups (LCGs), information about logical channels or logical channel groups to which BSR_TRIGGER_COUNT is to be applied, and trigger BSR.
  • LCHs logical channels
  • LCGs logical channel groups
  • the RRCConnectionReconfiguration message includes configuration information of the DRB to which user data is to be processed.
  • the terminal applies the information included in the RRCConnectionReconfiguration message to set up a DRB, configure functions of each layer, and transmit an RRCConnectionReconfigurationComplete message to the base station (5e-25).
  • the terminal transmits and receives data with the base station (5e-30).
  • the base station may send a RRCConnectionReconfiguration message back to the terminal (5e-35) if necessary, and may reconfigure configuration information of each layer of the terminal.
  • the RRCConnectionReconfiguration message may store RRC connection configuration information, configuration information of each layer, and the like.
  • the RRCConnectionReconfiguration message may also include mapping information between logical channels (LCHs) and logical channel groups (LCGs), information about logical channels or logical channel groups to which BSR_TRIGGER_COUNT is to be applied, and trigger BSR.
  • LCHs logical channels
  • LCGs logical channel groups
  • BSR_TRIGGER_COUNT information about logical channels or logical channel groups to which BSR_TRIGGER_COUNT is to be applied
  • BSR_TRIGGER_COUNT Information about a threshold for comparing BSR_TRIGGER_COUNT values, mapping information for logical channels or logical channel groups and TTI, and information indicating whether or not URLLC service for logical channels or logical channel groups (indication) and the like.
  • the UE Upon completing the configuration of each layer device according to the information included in the RRCConnectionReconfiguration message, the UE transmits an RRCConnectionReconfigurationComplete message to the base station (5e-40).
  • 5F is a diagram illustrating a procedure for requesting transmission resources from a base station by a terminal according to a fifth embodiment of the present invention to transmit uplink data.
  • the terminal when data to be transmitted on the uplink is generated, the terminal first checks whether transmission resources for a scheduling request (SR) are allocated to the terminal. If the transmission resource for the SR is allocated, the terminal performs a scheduling request procedure (5f-05).
  • SR scheduling request
  • the terminal sends a scheduling request to the base station by using the transmission resource allocated for the SR (5f-10). Since the base station has previously allocated the SR transmission resource to the terminal, when the scheduling request is received as the SR transmission resource, the base station can know which terminal requested the scheduling.
  • the base station allocates an uplink transmission resource so that the terminal can send buffer status information in response to the scheduling request (5f-15). That is, the control signal can be instructed to send using any transmission resources in time / frequency.
  • the terminal allocated the uplink transmission resource reports a buffer status report (BSR) for the logical channels or the logical channel groups owned by the current terminal to the base station using the transmission resource (5f-20). ). If the uplink transmission resources are sufficient, the terminal may transmit uplink transmission data together.
  • the base station receiving the BSR report allocates a transmission resource for uplink data transmission to the terminal through scheduling (5f-25). That is, the control signal can be instructed to send using any transmission resources in time / frequency.
  • the terminal may perform a random access procedure (5f-30).
  • the base station may transmit a preamble to the base station (5f-35), receive a random access response (RAR) (5f-40), and transmit a message 3 to request the connection to the base station (5f-45).
  • the base station may send a message 4 to inform the terminal that the random access procedure was successfully performed (5f-50).
  • the terminal may send a message 5 to complete the connection setup after the message 4, and if the transmission resources are sufficient, the BSR may also send the message 5 together, complete the RRC connection setup and transmit and receive data.
  • 5G is a diagram illustrating formats that a terminal can use when transmitting a BSR to a base station according to a fifth embodiment of the present invention.
  • the first BSR format may include a 2-bit reserved field, a 2-bit logical channel group identifier (LCG ID), and a 6-bit buffer size field (5g-05).
  • the first BSR format may be used for reporting when only one logical channel group among the logical channel groups has data.
  • the second BSR format may consist of four 6-bit buffer size fields (5g-10). Each 6-bit buffer size field is information indicating each predefined logical channel group. In addition, the second BSR format may be used for reporting when two or more logical channel groups have data.
  • the third BSR format may include a 2-bit reserved field, a 4-bit logical channel identifier (LCH ID), and a 10-bit buffer size field (5g-15).
  • the third BSR format may be used for reporting a buffer status for a specific logical channel indicated by a base station, and may report a more specific buffer status of a specific logical channel.
  • the different BSR formats may have different MAC CE fields in the header. Or, even if the same MAC CE field may have an additional field for distinguishing the BSR formats.
  • the buffer size field of the first BSR format and the second BSR format may indicate a value sampled at a log scale between the minimum value and the maximum value of the buffer table.
  • the buffer size field of the BSR format may indicate a value sampled on a linear scale between the minimum value and the maximum value of the buffer table.
  • a fifth embodiment of triggering a BSR in the present invention is as follows.
  • the terminal may have a first BSR, a second BSR, and a third BSR.
  • the first BSR, the second BSR, and the third BSR may use the first BSR format or the second BSR format described with reference to FIG. 5G. That is, the first BSR format may be used for reporting when only one logical channel group among the logical channel groups has data.
  • the second BSR format may be used for reporting when two or more logical channel groups have data.
  • the first BSR is a regular BSR and is triggered when the first condition is satisfied.
  • the first BSR triggers a scheduling request (SR). That is, a scheduling request is made to the base station by using a preset SR transmission resource. If there is no preset SR transmission resource, a random access procedure may be performed. Alternatively, if the UL transmission is not received after performing the SR transmission n times, the random access procedure may be performed.
  • SR scheduling request
  • newly generated data in the terminal is generated in a logical channel or a logical channel group having a higher priority than other data previously generated and stored in the buffer, or in the existing buffer. This is the case when there is no data, newly generated data, or when the BSR retransmission timer expires.
  • the BSR retransmission timer (retxBSR-Timer) is updated every time one BSR of the three BSRs is transmitted, and the timer value can be set by the base station. For example, the timer value may be set in steps 5e-10, 5e-20, or 5e-35 of FIG. 5E.
  • the second BSR is a padding BSR. If the second condition is satisfied, the second BSR may be transmitted to the base station together with the data.
  • the size of the padding added is the size of the BSR and the BSR. This is larger than the sum of the header sizes for.
  • the third BSR is a periodic BSR, and if the third condition is satisfied, the third BSR may be transmitted to the base station when the terminal has uplink transmission resources.
  • the periodic BSR-Timer for periodic BSR expires.
  • the periodic BSR-Timer for periodic BSR transmits one BSR among three BSRs. It is updated each time and the timer value can be set by the base station. For example, the timer value may be set in steps 5e-10, 5e-20, or 5e-35 of FIG. 5E.
  • only the first BSR may trigger the SR, and the second BSR and the third BSR may be sent when the uplink transmission resource is allocated.
  • the embodiment of the above 5-1 is simple to implement, since the case of triggering an SR is applicable only when data is generated in logical channels or logical channel groups having a higher priority, they have the same priority or more. If data continues to occur in the low priority logical channels or logical channel groups, a delay may occur when the SR is not triggered to ensure a high data rate. Accordingly, the second embodiment of the present invention proposes additional variables and conditions to compensate for this.
  • a fifth embodiment of triggering an SR in the present invention is as follows.
  • the terminal may have a first BSR, a second BSR, and a third BSR.
  • the first BSR, the second BSR, and the third BSR may use the first BSR format or the second BSR format described with reference to FIG. 5G. That is, the first BSR format may be used for reporting when only one logical channel group among the logical channel groups has data.
  • the second BSR format may be used for reporting when two or more logical channel groups have data.
  • the first BSR is a regular BSR and is triggered when the first condition is satisfied.
  • the first BSR triggers a scheduling request (SR). That is, a scheduling request is made to the base station by using a preset SR transmission resource. If there is no preset SR transmission resource, a random access procedure may be performed. Alternatively, if the UL transmission is not received after performing the SR transmission n times, the random access procedure may be performed.
  • SR scheduling request
  • the UE may define a new variable called BSR_TRIGGER_COUNT, and provides information on logical channels or logical channel groups to which the BSR_TRIGGER_COUNT variable is to be applied and information on a threshold value to be compared with the variable in steps 5e-10 of FIG. 5E. Alternatively, it can be received in steps 5e-20 or 5e-35.
  • the terminal When the terminal generates data in the logical channels or the logical channel groups configured as the logical channels or the logical channel groups to be applied to the BSR_TRIGGER_COUNT variable, the terminal accumulates the newly created data size in BSR_TRIGGER_COUNT and maintains the BSR_TRIGGER_COUNT value. .
  • the BSR_TRIGGER_COUNT value is initialized to 0 when the UE transmits one BSR among three BSRs. If the data is newly generated in the configured logical channels or logical channel groups, the BSR_TRIGGER_COUNT value is accumulated and added, and the value is added. Keep it. If the value of the BSR_TRIGGER_COUNT exceeds the threshold value set above, the first condition is additionally included.
  • the first BSR when the value of BSR_TRIGGER_COUNT exceeds the set threshold value, the first BSR is triggered and the first BSR triggers the SR.
  • the triggering of the first BSR is performed after transmitting the current MAC PDU instead of immediately triggering the first BSR (the current MAC PDU is not transmitted. This is because the UE performs the logical channel prioritization procedure again when triggering BSR of H.
  • the BSR_TRIGGER_COUNT value is accumulated even though the logical channels or logical channel groups configured from the base station have a lower priority.
  • the first BSR may be triggered and the first BSR may trigger the SR when the threshold value is exceeded and the threshold value is exceeded.
  • the BSR_TRIGGER_COUNT value does not accumulate for the data included in the BSR previously reported by the UE (because the BSR_TRIGGER_COUNT value is reset to 0 every time BSR is sent).
  • the first condition related to the BSR_TRIGGER_COUNT variable added above enables the terminal to continuously trigger the first BSR and allow the first BSR to request the SR without causing a delay in a high data rate situation.
  • the BSR retransmission timer (retxBSR-Timer) is updated every time one BSR of three BSRs is transmitted, and a timer value may be set by the base station.
  • a timer value may be set by the base station.
  • the timer value may be set in steps 5e-10, 5e-20, or 5e-35 of FIG. 5E.
  • the second BSR is a padding BSR. If the second condition is satisfied, the second BSR may be transmitted to the base station together with the data.
  • the size of the padding added is the size of the BSR and the BSR. This is larger than the sum of the header sizes for.
  • the third BSR is a periodic BSR, and if the third condition is satisfied, the third BSR may be transmitted to the base station when the terminal has uplink transmission resources.
  • the periodic BSR-Timer for the periodic BSR is updated every time one BSR of the three BSRs is transmitted, and the timer value may be set by the base station.
  • the timer value may be set in steps 5e-10, 5e-20, or 5e-35 of FIG. 5E.
  • only the first BSR may trigger the SR, and the second BSR and the third BSR may be sent when the uplink transmission resource is allocated.
  • a fifth embodiment of triggering an SR in the present invention is as follows.
  • the UE may have a first BSR, a second BSR, and a third BSR.
  • the first BSR, the second BSR, and the third BSR may use the first BSR format or the second BSR format described with reference to FIG. 5G. That is, the first BSR format may be used for reporting when only one logical channel group among the logical channel groups has data.
  • the second BSR format may be used for reporting when two or more logical channel groups have data.
  • the first BSR When the first BSR is triggered when the first condition is met with a regular BSR, the first BSR triggers a scheduling request (SR). That is, a scheduling request is made to the base station by using a preset SR transmission resource. If there is no preset SR transmission resource, a random access procedure may be performed. Alternatively, if the UL transmission is not received after performing the SR transmission n times, the random access procedure may be performed.
  • SR scheduling request
  • the UE may define a new variable called BSR_TRIGGER_COUNT, and provides information on logical channels or logical channel groups to which the BSR_TRIGGER_COUNT variable is to be applied and information on a threshold value to be compared with the variable in steps 5e-10 of FIG. 5E. Alternatively, it can be received in steps 5e-20 or 5e-35.
  • the terminal may define a new variable called BSR_TRIGGER_COUNT, and provides information on logical channels or logical channel groups to which the BSR_TRIGGER_COUNT variable is to be applied and information on a threshold value to be compared with the variable in steps 5e-10 of FIG. 5E. Alternatively, it can be received in steps 5e-20 or 5e-35.
  • the terminal When data is transmitted in logical channels or logical channel groups configured as logical channels or logical channel groups to be applied to the BSR_TRIGGER_COUNT variable, the terminal accumulates the size of the transmitted data to BSR_TRIGGER_COUNT and maintains a BSR_TRIGGER_COUNT value.
  • the BSR_TRIGGER_COUNT value is initialized to 0 when the UE transmits one BSR among three BSRs, and accumulates and adds the size when data is newly transmitted in the configured logical channels or logical channel groups. Keep it. If the value of the BSR_TRIGGER_COUNT exceeds the threshold value set above, the first condition is additionally included.
  • the first BSR when the value of BSR_TRIGGER_COUNT exceeds the set threshold value, the first BSR is triggered, and the first BSR triggers the SR.
  • the first BSR when the value of the BSR_TRIGGER_COUNT exceeds the threshold value set above, the first BSR is triggered after the current MAC PDU is transmitted instead of immediately triggering the first BSR (the current MAC PDU is not transmitted. Triggering a BSR of 1 causes the UE to perform LCP (logical channel prioritization) again, so even though it has a lower priority for the logical channels or logical channel groups configured from the base station, the value of BSR_TRIGGER_COUNT is lower.
  • LCP logical channel prioritization
  • the first BSR may be triggered and the first BSR may trigger the SR.
  • the BSR_TRIGGER_COUNT value does not accumulate the data included in the BSR previously reported by the UE. (BSR_TRIGGER_COUNT is reset to 0 each time you send a BSR.
  • the first condition related to the BSR_TRIGGER_COUNT variable added above allows the terminal to continuously trigger the first BSR and allow the first BSR to request an SR without causing a delay in a high data rate situation.
  • the BSR retransmission timer (retxBSR-Timer) is updated every time one BSR of the three BSRs is transmitted, and the timer value can be set by the base station.
  • the timer value may be set in steps 5e-10, 5e-20, or 5e-35 of FIG. 5E.
  • the second BSR is a padding BSR. If the second condition is satisfied, the second BSR may be transmitted to the base station together with the data.
  • the size of the padding added is the size of the BSR and the BSR. This is larger than the sum of the header sizes for.
  • the third BSR is a periodic BSR, and if the third condition is satisfied, the third BSR may be transmitted to the base station when the terminal has uplink transmission resources.
  • the periodic BSR-Timer for the periodic BSR is updated every time one BSR of the three BSRs is transmitted, and the timer value may be set by the base station.
  • the timer value may be set in steps 5e-10, 5e-20, or 5e-35 of FIG. 5E.
  • only the first BSR may trigger the SR, and the second BSR and the third BSR may be sent when an uplink transmission resource is allocated.
  • Embodiments 5-4 of the present invention may be additionally applied to the above-described embodiments of 5-1, 5-2, or 5-3. That is, the base station may preset information about logical channels or logical channel groups corresponding to the URLLC service in step 5e-10, step 5e-20, or step 5e-35 of FIG. 5e.
  • the terminal checks whether the data is generated in logical channels or logical groups designated by the URLLC service, and if the data is logical channels designated in the URLLC service.
  • the UE may trigger the SR and send the first BSR for the logical channels or the logical channel groups corresponding to the URLLC. That is, the case where data occurs in the logical channels or the logical groups designated by the URLLC service may be added to the first condition of the embodiment 5-1, 5-2, or 5-3. have.
  • the fifth to fifth embodiments of the present invention may be additionally applied to the above-described embodiments of 5-1, 5-2, or 5-3. That is, the base station may preset information about logical channels or logical channel groups corresponding to the URLLC service in step 5e-10, step 5e-20, or step 5e-35 of FIG. 5e.
  • the terminal checks whether the data is generated in logical channels or logical groups designated by the URLLC service, and if the data is in logical channels or designated by the URLLC service. If the data is generated in the logical groups, the UE may report an additional buffer status using the third BSR format. That is, when the data generated in the terminal is data generated in the logical channels or logical groups designated by the URLLC service, the condition is the above-described embodiment of 5-1 or 5-2 or 5-3. It may be included in the first condition of the embodiment of the.
  • the UE may transmit an additional BSR (third BSR format) along with the first BSR (using the first BSR format or the second BSR format) in the MAC PDU to the base station. . That is, the BSR information for the logical channel groups and the BSR information for the logical channel for the additional URLLC service may be transmitted.
  • the terminal may report the buffer status for the logical channel group set as the URLLC service using the first BSR format (the third BSR format).
  • the BSR format may report the buffer status for one logical channel). That is, when data is generated in a plurality of logical channels satisfying the additional condition and configured as URLLC service, the UE may add additional BSR (first BSR format or second BSR format) together with a first BSR (first BSR format).
  • BSR format of 1) may be inserted into the MAC PDU and transmitted to the base station. That is, the BSR information for the logical channel groups and the BSR information for the logical channel group for the additional URLLC service can be transmitted.
  • the base station can confirm that data for URLLC service is generated to the terminal due to the additional BSR information, and can check specific buffer status information for the base station, so that the base station can allocate uplink transmission resources to the terminal quickly through scheduling. Can be.
  • the base station may allocate a transmission resource corresponding to the TTI mapped to the logical channel or the logical channel group mapped to the URLLC service.
  • 5h illustrates the operation of a terminal according to the embodiment 5-1, the embodiment 5-2, the embodiment 5-3, the embodiment 5-5, and the embodiment 5-5 in the present invention. It is a diagram showing.
  • the terminal 5h-01 checks the first condition, the second condition, and the third condition (5h-05). If the first condition is satisfied, the UE checks whether transmission resources for the SR are pre-allocated (5h-10). If a transmission resource for the SR is allocated, the UE may trigger the SR (5h-15), transmit the first BSR, and if the additional BSR is configured, may transmit the BSR including the additional BSR (5h-20). If the SR transmission resource is not allocated in step 5h-10, the UE performs a random access procedure (5h-25), transmits the first BSR, and if the additional BSR is configured, may transmit the BSR including the additional BSR. (5h-30).
  • step 5h-05 the terminal waits until a transmission resource is given to the terminal and then transmits a second BSR if the transmission resource is given (5h-35). If the third condition is satisfied in step 5h-05, the terminal waits until a transmission resource is given to the terminal and then transmits a third BSR if the transmission resource is given (5h-40).
  • 5I illustrates a structure of a terminal to which the fifth embodiment of the present invention can be applied.
  • the terminal includes a radio frequency (RF) processor 5i-10, a baseband processor 5i-20, a storage 5i-30, and a controller 5i-40. .
  • RF radio frequency
  • the RF processor 5i-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 5i-10 up-converts the baseband signal provided from the baseband processor 5i-20 into an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 5i-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. Can be. In the figure, only one antenna is shown, but the terminal may include a plurality of antennas.
  • the RF processor 5i-10 may include a plurality of RF chains.
  • the RF processor 5i-10 may perform beamforming. For the beamforming, the RF processor 5i-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processor may perform MIMO, and may receive multiple layers when performing the MIMO operation.
  • the RF processor 5i-10 may perform reception beam sweeping by appropriately setting a plurality of antennas or antenna elements under the control of the controller, or may adjust the direction and beam width of the reception beam so that the reception beam is coordinated with the transmission beam. have.
  • the baseband processor 5i-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the system. For example, during data transmission, the baseband processor 5i-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 5i-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 5i-10. For example, in accordance with an orthogonal frequency division multiplexing (OFDM) scheme, during data transmission, the baseband processor 5i-20 generates complex symbols by encoding and modulating a transmission bit stream, and the complex symbols are subcarriers.
  • OFDM orthogonal frequency division multiplexing
  • OFDM symbols are configured through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • the baseband processor 5i-20 divides the baseband signal provided from the RF processor 5i-10 in OFDM symbol units and subcarriers through fast Fourier transform (FFT) operations. After recovering the mapped signals, the received bit stream is recovered through demodulation and decoding.
  • FFT fast Fourier transform
  • the baseband processor 5i-20 and the RF processor 5i-10 transmit and receive signals as described above. Accordingly, the baseband processor 5i-20 and the RF processor 5i-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. Furthermore, at least one of the baseband processor 5i-20 and the RF processor 5i-10 may include a plurality of communication modules to support different radio access technologies. In addition, at least one of the baseband processor 5i-20 and the RF processor 5i-10 may include different communication modules to process signals of different frequency bands. For example, the different radio access technologies may include an LTE network, an NR network, and the like. In addition, the different frequency bands may include a super high frequency (SHF) (eg 2.5 GHz, 5 Ghz) band and a millimeter wave (eg 60 GHz) band.
  • SHF super high frequency
  • the storage unit 5i-30 stores data such as a basic program, an application program, and setting information for the operation of the terminal.
  • the storage unit 5i-30 provides stored data at the request of the control unit 5i-40.
  • the controller 5i-40 controls overall operations of the terminal. For example, the controller 5i-40 transmits and receives a signal through the baseband processor 5i-20 and the RF processor 5i-10. In addition, the control unit 5i-40 records and reads data in the storage unit 5i-40. To this end, the controller 5i-40 may include at least one processor. For example, the controller 5i-40 may include a communication processor (CP) for performing control for communication and an application processor (AP) for controlling a higher layer such as an application program. The control unit 5i-40 may include a multiple connection processing unit 5i-42 which performs processing for operating in the multiple connection mode.
  • CP communication processor
  • AP application processor
  • the control unit 5i-40 may include a multiple connection processing unit 5i-42 which performs processing for operating in the multiple connection mode.
  • 5J is a block diagram of a base station in a wireless communication system to which a fifth embodiment of the present invention can be applied.
  • the base station includes an RF processor 5j-10, a baseband processor 5j-20, a backhaul communication unit 5j-30, a storage unit 5j-40, and a controller 5j-50. It is configured to include.
  • the RF processor 5j-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of a signal. That is, the RF processor 5j-10 up-converts the baseband signal provided from the baseband processor 5j-20 into an RF band signal and transmits the same through an antenna, and receives the RF band signal received through the antenna. Downconverts to a baseband signal.
  • the RF processor 5j-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. In the figure, only one antenna is shown, but the base station may have a plurality of antennas.
  • the RF processor 5j-10 may include a plurality of RF chains.
  • the RF processor 5j-10 may perform beamforming. For the beamforming, the RF processor 5j-10 may adjust phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processor may perform a downlink MIMO operation by transmitting one or more layers.
  • the baseband processor 5j-20 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the radio access technology. For example, during data transmission, the baseband processor 5j-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 5j-20 restores the received bit string by demodulating and decoding the baseband signal provided from the RF processor 5j-10. For example, according to the OFDM scheme, during data transmission, the baseband processor 5j-20 generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then IFFT. OFDM symbols are constructed by operation and CP insertion.
  • the baseband processor 5j-20 divides the baseband signal provided from the RF processor 5j-10 in OFDM symbol units and restores signals mapped to subcarriers through an FFT operation. After that, the received bit stream is recovered by demodulation and decoding.
  • the baseband processor 5j-20 and the RF processor 5j-10 transmit and receive signals as described above. Accordingly, the baseband processor 5j-20 and the RF processor 5j-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.
  • the communication unit 5j-30 provides an interface for communicating with other nodes in the network.
  • the storage unit 5j-40 stores data such as a basic program, an application program, and setting information for the operation of the base station.
  • the storage unit 5j-40 may store information on bearers allocated to the connected terminals, measurement results reported from the connected terminals, and the like.
  • the storage unit 5j-40 may store information that is a criterion for determining whether to provide or terminate multiple connections to the terminal.
  • the storage unit 5j-40 provides stored data at the request of the controller 5j-50.
  • the controller 5j-50 controls the overall operations of the base station. For example, the controller 5j-50 transmits and receives a signal through the baseband processor 5j-20 and the RF processor 5j-10 or through the backhaul communication unit 5j-30. In addition, the control unit 5j-50 records and reads data in the storage unit 5j-40. To this end, the controller 5j-50 may include at least one processor. The control unit 5j-50 may include a multiple connection processing unit 5j-52 which performs processing for operating in the multiple connection mode.
  • a computer-readable storage medium for storing one or more programs (software modules) may be provided.
  • One or more programs stored in a computer readable storage medium are configured for execution by one or more processors in an electronic device.
  • One or more programs include instructions that cause an electronic device to execute methods in accordance with embodiments described in the claims or specification of the present invention.
  • Such programs may include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM.
  • EEPROM Electrically Erasable Programmable Read Only Memory
  • magnetic disc storage device compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms
  • CD-ROM compact disc ROM
  • DVDs digital versatile discs
  • It can be stored in an optical storage device, a magnetic cassette. Or, it may be stored in a memory composed of some or all of these combinations.
  • each configuration memory may be included in plural.
  • the program may be configured through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN), or a combination thereof. It may be stored in an attachable storage device that is accessible. Such a storage device may be connected to a device for performing an embodiment of the present invention through an external port. In addition, a separate storage device on a communication network may be connected to a device for performing an embodiment of the present invention.
  • a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN), or a combination thereof. It may be stored in an attachable storage device that is accessible. Such a storage device may be connected to a device for performing an embodiment of the present invention through an external port.
  • a separate storage device on a communication network may be connected to a device for performing an embodiment of the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur une technique de communication permettant de combiner, avec la technologie Internet des objets (IdO), un système de communication 5G destiné à prendre en charge un débit de transmission de données supérieur à celui d'un système 4G, et sur un système correspondant. La présente invention peut être appliquée à des services intelligents (par exemple, des services liés aux maisons intelligentes, aux bâtiments intelligents, aux villes intelligentes, aux voitures intelligentes ou connectées, aux soins de santé, à l'enseignement numérique, au commerce de détail, à la sécurité et à la sûreté, etc.) sur la base de la technologie de communication 5G et de la technologie relative à IdO. Un mode de réalisation de la présente invention porte sur un procédé et un dispositif pour rechercher un terminal par utilisation d'une antenne directionnelle.
PCT/KR2018/003331 2017-03-24 2018-03-22 Procédé et dispositif pour effectuer une recherche de mobile dans un système de communication mobile WO2018174579A1 (fr)

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EP18771935.6A EP3589040B1 (fr) 2017-03-24 2018-03-22 Configuration d'occasions de recherche de mobile dans un système de communication mobile pour des signaux de recherche de mobile transmis sur plusieurs rayons
CN202211021871.2A CN115568016A (zh) 2017-03-24 2018-03-22 用于在移动通信系统中执行寻呼的方法和设备
CN201880020499.9A CN110463297B (zh) 2017-03-24 2018-03-22 用于在移动通信系统中执行寻呼的方法和设备
US16/495,726 US11463986B2 (en) 2017-03-24 2018-03-22 Method and device for performing paging in mobile communication system
US17/954,810 US11743862B2 (en) 2017-03-24 2022-09-28 Method and device for performing paging in mobile communication system

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KR20170037414 2017-03-24
KR10-2017-0037414 2017-03-24
KR1020170125012A KR102367840B1 (ko) 2017-03-24 2017-09-27 이동통신 시스템에서 페이징을 수행하는 방법 및 장치
KR10-2017-0125012 2017-09-27

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US16/495,726 A-371-Of-International US11463986B2 (en) 2017-03-24 2018-03-22 Method and device for performing paging in mobile communication system
US17/954,810 Continuation US11743862B2 (en) 2017-03-24 2022-09-28 Method and device for performing paging in mobile communication system

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